His action was not disinterested because he hoped to make money out of the affair.

"他的行为并不是无私的,因为他希望中赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 中给我挑了一件最便宜的。

They get the juice out of the fruit by treading it.

他们踩踏水果中榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

中提取的松香和鞣酸是化学工业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我们把这个弄完吧，别等老板来了中作梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯定有告诉过她老板她想离开。是谁在中作梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

第一项任务是削减金属中pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应助那些的，却中谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采用水平切片淀粉凝胶电泳检测了七种同工酶的酶谱图式，中筛选出酯酶(EST)同工酶进一步作聚丙烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫等第三方插件的开发并中获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运用热力学第一、二定律,特别是第二定律(火用)(有效能)的概念,对燕化炼油厂二蒸馏车间的能量平衡和(火用)平衡进行标定核算,分析了装置的用能情况,并中发现问题,提出改进意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织中酚类、黄酮类等次生代谢物较多，要中提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通过对釉面砖模板过早失效分析,中找出引起失效的主要原因·对提高其使用寿命有一定的指导作用。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我们的大学生活,有许多自由时间,这些时间,我们都会安排出门逛街,吃东西,大多时候,是和朋友一起,少数时候,是自己一个,我们中得到了许多乐趣.

His action was not disinterested because he hoped to make money out of the affair.

"他的行为并不是无私的,因为他希望从中赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 从中给我挑了一件最便宜的。

They get the juice out of the fruit by treading it.

他们踩踏水果从中榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

从中提取的松香和鞣酸是化学工业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我们把这个弄完吧，别等老板来了从中梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯有告诉过她老板她想离开。是谁在从中梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

第一项任务是削减金属从中pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应该帮助那些的，却藉此从中谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采用水平切片淀粉凝胶电泳检测了七种同工酶的酶谱图式，从中筛选出酯酶(EST)同工酶进一步烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫等第三方插件的开发并从中获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运用热力学第一、二律,特别是第二律(火用)(有效能)的概念,对燕化炼油厂二蒸馏车间的能量平衡和(火用)平衡进行标核算,分析了装置的用能情况,并从中发现问题,提出改进意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织中酚类、黄酮类等次生代谢物较多，要从中提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通过对釉面砖模板过早失效分析,从中找出引起失效的主要原因·对提高其使用寿命有一的指导用。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我们的大学生活,有许多自由时间,这些时间,我们都会安排出门逛街,吃东西,大多时候,是和朋友一起,少数时候,是自己一个,我们从中得到了许多乐趣.

His action was not disinterested because he hoped to make money out of the affair.

"他的行为并不是无私的,因为他希望从中赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 从中给我挑了一件最便宜的。

They get the juice out of the fruit by treading it.

他水果从中榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

从中提取的松香和鞣酸是化学工业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我把这个弄完吧，别等老板来了从中作梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯定有告诉过她老板她想离开。是谁在从中作梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

第一项任务是削减金属从中pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应该帮助那些的，却藉此从中谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采水平切片淀粉凝胶电泳检测了七种同工酶的酶谱图式，从中筛选出酯酶(EST)同工酶进一步作聚丙烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫等第三方插件的开发并从中获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运学第一、二定律,特别是第二定律(火)(有效能)的概念,对燕化炼油厂二蒸馏车间的能量平衡和(火)平衡进行标定核算,分析了装置的能情况,并从中发现问题,提出改进意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织中酚类、黄酮类等次生代谢物较多，要从中提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通过对釉面砖模板过早失效分析,从中找出引起失效的主要原因·对提高其使寿命有一定的指导作。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我的大学生活,有许多自由时间,这些时间,我都会安排出门逛街,吃东西,大多时候,是和朋友一起,少数时候,是自己一个,我从中得到了许多乐趣.

His action was not disinterested because he hoped to make money out of the affair.

"他的行为并不是无私的,因为他希望从中赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 从中给我挑了件最便宜的。

They get the juice out of the fruit by treading it.

他们踩踏水果从中榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

从中提取的松香和鞣酸是化学工业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我们把这个弄完吧，别等老板来了从中作梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯定有告老板想离开。是谁在从中作梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

第项任务是削减金属从中pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应该帮助那些的，却藉此从中谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采用水平切片淀粉凝胶电泳检测了七种同工的谱图式，从中筛选出酯(EST)同工步作聚丙烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫等第三方插件的开发并从中获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运用热力学第、二定律,特别是第二定律(火用)(有效能)的概念,对燕化炼油厂二蒸馏车间的能量平衡和(火用)平衡行标定核算,分析了装置的用能情况,并从中发现问题,提出改意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织中酚类、黄酮类等次生代谢物较多，要从中提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通对釉面砖模板早失效分析,从中找出引起失效的主要原因·对提高其使用寿命有定的指导作用。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我们的大学生活,有许多自由时间,这些时间,我们都会安排出门逛街,吃东西,大多时候,是和朋友起,少数时候,是自己个,我们从中得到了许多乐趣.

His action was not disinterested because he hoped to make money out of the affair.

"他的行为并不是无私的,因为他希望从中赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 从中给我挑了一件最便宜的。

They get the juice out of the fruit by treading it.

他们踩踏水果从中榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

从中提取的松香是化学工业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我们把这个弄完吧，别老板来了从中作梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯定有告诉过她老板她想离开。是谁在从中作梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

一项任务是削减金属从中pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应该帮助那些的，却藉此从中谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采用水平切片淀粉凝胶电泳检测了七种同工酶的酶谱图式，从中筛选出酯酶(EST)同工酶进一步作聚丙烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫方插件的开发并从中获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运用热力学一、二定律,特别是二定律(火用)(有效能)的概念,对燕化炼油厂二蒸馏车间的能量平衡(火用)平衡进行标定核算,分析了装置的用能情况,并从中发现问题,提出改进意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织中酚类、黄酮类次生代谢物较多，要从中提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通过对釉面砖模板过早失效分析,从中找出引起失效的主要原因·对提高其使用寿命有一定的指导作用。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我们的大学生活,有许多自由时间,这些时间,我们都会安排出门逛街,吃东西,大多时候,是朋友一起,少数时候,是自己一个,我们从中得到了许多乐趣.

His action was not disinterested because he hoped to make money out of the affair.

"他的行是无私的,因他希望从中赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 从中给我挑了一件最便宜的。

They get the juice out of the fruit by treading it.

他们踩踏水果从中榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

从中提取的松香和鞣酸是化学工业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我们把这个弄完吧，别等老板来了从中作梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯定有告诉过她老板她想离开。是谁在从中作梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

第一项任务是削减金属从中pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应该帮助那些的，却藉此从中谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采用水切片淀粉凝胶电泳检测了七种同工酶的酶谱图式，从中筛选出酯酶(EST)同工酶进一步作聚丙烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫等第三方插件的开发从中获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运用热力学第一、二定律,特别是第二定律(火用)(有效能)的概念,对燕化炼油厂二蒸馏车间的能和(火用)进行标定核算,分析了装置的用能情况,从中发现问题,提出改进意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织中酚类、黄酮类等次生代谢物较多，要从中提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通过对釉面砖模板过早失效分析,从中找出引起失效的主要原因·对提高其使用寿命有一定的指导作用。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我们的大学生活,有许多自由时间,这些时间,我们都会安排出门逛街,吃东西,大多时候,是和朋友一起,少数时候,是自己一个,我们从中得到了许多乐趣.

His action was not disinterested because he hoped to make money out of the affair.

"他的行为并不是无私的,因为他希望从中赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 从中给我挑了件最便宜的。

They get the juice out of the fruit by treading it.

他们踩踏水果从中榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

从中提取的松香和鞣酸是化学业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我们把这个弄完吧，别等老板来了从中作梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯定有告诉过她老板她想离开。是谁在从中作梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

第务是削减金属从中pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应该帮助那些的，却藉此从中谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采用水平切片淀粉凝胶电泳检测了七酶的酶谱图式，从中筛选出酯酶(EST)酶进步作聚丙烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫等第三方插件的开发并从中获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运用热力学第、二定律,特别是第二定律(火用)(有效能)的概念,对燕化炼油厂二蒸馏车间的能量平衡和(火用)平衡进行标定核算,分析了装置的用能情况,并从中发现问题,提出改进意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织中酚类、黄酮类等次生代谢物较多，要从中提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通过对釉面砖模板过早失效分析,从中找出引起失效的主要原因·对提高其使用寿命有定的指导作用。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我们的大学生活,有许多自由时间,这些时间,我们都会安排出门逛街,吃东西,大多时候,是和朋友起,少数时候,是自己个,我们从中得到了许多乐趣.

His action was not disinterested because he hoped to make money out of the affair.

"他的行为并不是无私的,因为他希赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 给我挑了一件最便宜的。

They get the juice out of the fruit by treading it.

他们踩踏水果榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

提取的松香和鞣酸是学工业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我们把这个弄完吧，别等老板来了作梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯定有告诉过她老板她想离开。是谁在作梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

第一项任务是削减金属pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应该帮助那些的，却藉此谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采用水平切片淀粉凝胶电泳检测了七种同工酶的酶谱图式，筛选出酯酶(EST)同工酶进一步作聚丙烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫等第三方插件的开发并获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运用热力学第一、二定律,特别是第二定律(火用)(有效能)的概念,对燕厂二蒸馏车间的能量平衡和(火用)平衡进行标定核算,分析了装置的用能情况,并发现问题,提出改进意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织酚类、黄酮类等次生代谢物较多，要提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通过对釉面砖模板过早失效分析,找出引起失效的主要原因·对提高其使用寿命有一定的指导作用。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我们的大学生活,有许多自由时间,这些时间,我们都会安排出门逛街,吃东西,大多时候,是和朋友一起,少数时候,是自己一个,我们得到了许多乐趣.

His action was not disinterested because he hoped to make money out of the affair.

"他的行为并不是无私的,因为他希望中赚钱。"

He looked through the suits and selected the cheapest one for me.

他仔细地查看衣服, 中给我挑了一件最便宜的。

They get the juice out of the fruit by treading it.

他们踩踏水果中榨汁。

The risin and tannin that can be extracted from it are sought by the chemical industry.

中提取的松香和鞣酸是化学工业上很需要的。

Let’s get this finished before the boss comes along and throws a spanner in the works.

我们把这个弄完吧，别等老板来了中作梗。

Somebody must have told her boss about her plans to leave.Who was trying to queer her pitch?

肯定有告诉过她老板她想离开。是谁在中作梗呢？

The first task is to cut the various pieces of metal from which the pulsejet body is formed.

第一项任务是削减金属中pulsejet身体的各个组成部分。

He’s been feathering his own nest at the expense of the people he was supposed to be helping.

他本来应助那些的，却中谋取私利。

Seven isozymes were analyzed by means of horizontal sliceable starch gel electrophoresis.Then further analysis of selected esterase(EST)was carried out on polyacrylamide gel electrophoresis(PAGE).

采用水平切片淀粉凝胶电泳检测了七种同工酶的酶谱图式，中筛选出酯酶(EST)同工酶进一步作聚丙烯酰胺凝胶电泳(PAGE)分析。

These content make clear a proof, tecent company is the tripartite plug-in unit such as anthozoan of license, support develop and from which of benefit.

这些内容明确证实，腾讯公司是许可、支持珊瑚虫等第三方插件的开发并中获益的。

In the paper,I use the first and especially the second law to analyse the thermal system for the calibration results of energy balance and exergic balance in No.

运用热力学第一、二定律,特别是第二定律(火用)(有效能)的概念,对燕化炼油厂二蒸馏车间的能量平衡和(火用)平衡进行标定核算,分析了装置的用能情况,并中发现问题,提出改进意见。

Because the mature tissue of velvetleaf contains lots of secondary metabolites such as alkaloid and phenolic, it is difficult to obtain high purity DNA from mature tissue of velvetleaf.

摘要青麻成熟组织中酚类、黄酮类等次生代谢物较多，要中提取出高纯度的DNA比较困难。

The main reason that causes early failure of glared tile die block is found through analysing.The analysing has some guiding functions for ingrowing using life of the glazed tile die block。

通过对釉面砖模板过早失效分析,中找出引起失效的主要原因·对提高其使用寿命有一定的指导作用。

In our life of university,we had much free time to arrange for strolling ectad or feeding.The mass of time,we got together with friends,another time,we were alone,we got more interest from that.

我们的大学生活,有许多自由时间,这些时间,我们都会安排出门逛街,吃东西,大多时候,是和朋友一起,少数时候,是自己一个,我们中得到了许多乐趣.