You should gather yourself together firstly under conditions of great danger.

在极其危险的情况下你应当先控制住自己。

It seems wise to reconnoiter before entering the town.

在进入那城以前, 先侦察一下是明智的。

Filter out all the dirt before using the water.

在用水以前先将其中不清洁的东西过滤掉。

Mary scraped the residue of food from the plates before putting them under water.

玛丽在把盘子放入水之前先刮去上面的食物残渣。

There's a special enclosure where you can look at the horses before the race starts.

"这里有一处特备的围场,在比赛前你以先看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯苯甲酸为原料,先进行醚化,再在三氯化铝的用下进行傅-克反应,简洁、高效的合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理工解释说，在给车重新喷漆之前，他们得先把车身毁坏的地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星期日，负责发现号轨道的工在跟国际空间站接轨前，必须先确定热障在起飞时没有损坏。

You should gather yourself together firstly under conditions of great danger.

在极其危险的情况下你应当控制住自己。

It seems wise to reconnoiter before entering the town.

在入那城以前, 侦察一下是明智的。

Filter out all the dirt before using the water.

在用水以前将其中不清洁的东西过滤掉。

Mary scraped the residue of food from the plates before putting them under water.

玛丽在把盘子放入水之前刮去上面的食物。

There's a special enclosure where you can look at the horses before the race starts.

"里有一处特备的围场,在比赛前你以看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯苯甲酸为原料,醚化,再在三氯化铝的作用下傅-克反应,简洁、高效的合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理工解释说，在给车重新喷漆之前，他们得把车身毁坏的地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星期日，负责发现号轨道的工作人员在跟国际空间站接轨前，必须确定热障在起飞时没有损坏。

You should gather yourself together firstly under conditions of great danger.

在极其危险的情况下你应当先控制住自己。

It seems wise to reconnoiter before entering the town.

在进入那城以前, 先侦察下是明智的。

Filter out all the dirt before using the water.

在用水以前先将其中不清洁的东西过滤掉。

Mary scraped the residue of food from the plates before putting them under water.

玛丽在把盘子放入水之前先刮去上面的食物残渣。

There's a special enclosure where you can look at the horses before the race starts.

"这有处特备的围场,在比赛前你以先看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯苯甲酸,先进行醚化,再在三氯化铝的作用下进行傅-克反应,简洁、高效的合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理工解释说，在给车重新喷漆之前，他们得先把车身毁坏的地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星期日，负责发现号轨道的工作人员在跟国际空间站接轨前，必须先确定热障在起飞时没有损坏。

You should gather yourself together firstly under conditions of great danger.

在险情况下你应当先控制住自己。

It seems wise to reconnoiter before entering the town.

在进入那城以前, 先侦察一下是明智。

Filter out all the dirt before using the water.

在用水以前先将中不清洁东西过滤掉。

Mary scraped the residue of food from the plates before putting them under water.

玛丽在把盘子放入水之前先刮去上面食物残渣。

There's a special enclosure where you can look at the horses before the race starts.

"这里有一处特备围场,在比赛前你以先看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯苯甲酸为原料,先进行醚化,再在三氯化铝作用下进行傅-克反应,简洁、高效合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理工解释说，在给车重新喷漆之前，他们得先把车身毁坏地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星期日，负责发现号工作人员在跟国际空间站接前，必须先确定热障在起飞时没有损坏。

You should gather yourself together firstly under conditions of great danger.

在极其危险的情况下你应当先控制住自己。

It seems wise to reconnoiter before entering the town.

在进入那城以前, 先侦察一下是明智的。

Filter out all the dirt before using the water.

在用水以前先将其中不清洁的东西过滤掉。

Mary scraped the residue of food from the plates before putting them under water.

玛丽在把盘子放入水之前先刮去上面的食物残渣。

There's a special enclosure where you can look at the horses before the race starts.

"这里有一的围场,在比赛前你以先看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯为原料,先进行醚化,再在三氯化铝的作用下进行傅-克反应,简洁、高效的合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理工解释说，在给车重新喷漆之前，他们得先把车身毁坏的地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星期日，负责发现号轨道的工作人员在跟国际空间站接轨前，必须先确定热障在起飞时没有损坏。

You should gather yourself together firstly under conditions of great danger.

在极其危险情况下你应当先控制住自己。

It seems wise to reconnoiter before entering the town.

在进入那城以前, 先侦察一下是。

Filter out all the dirt before using the water.

在用水以前先将其中不清洁东西过滤掉。

Mary scraped the residue of food from the plates before putting them under water.

玛丽在把盘子放入水之前先刮去上面食物残渣。

There's a special enclosure where you can look at the horses before the race starts.

"这里有一处特备围场,在比赛前你以先看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯苯甲酸为原料,先进行醚化,再在三氯化铝作用下进行傅-克反应,简洁、高效合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理工解释说，在给喷漆之前，他们得先把身毁坏地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星期日，负责发现号轨道工作人员在跟国际空间站接轨前，必须先确定热障在起飞时没有损坏。

You should gather yourself together firstly under conditions of great danger.

在极其危险的情况下你应当先控制住自己。

It seems wise to reconnoiter before entering the town.

在进入那城以前, 先侦察一下是明智的。

Filter out all the dirt before using the water.

在用水以前先将其中不清的东西。

Mary scraped the residue of food from the plates before putting them under water.

玛丽在把盘子放入水之前先刮去上面的食物残渣。

There's a special enclosure where you can look at the horses before the race starts.

"这里有一处特备的围场,在比赛前你以先看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯苯甲酸为原料,先进行醚化,再在三氯化铝的作用下进行傅-克反应,、效的合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理工解释说，在给车重新喷漆之前，他们得先把车身毁坏的地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星期日，负责发现号轨道的工作人员在跟国际空间站接轨前，必须先确定热障在起飞时没有损坏。

You should gather yourself together firstly under conditions of great danger.

危险情况下你应当先控制住自己。

It seems wise to reconnoiter before entering the town.

进入那城以前, 先侦察一下是明智。

Filter out all the dirt before using the water.

用水以前先将中不清洁东西过滤掉。

Mary scraped the residue of food from the plates before putting them under water.

玛丽把盘子放入水之前先刮去上面食物残渣。

There's a special enclosure where you can look at the horses before the race starts.

"这里有一处特备围场,比赛前你以先看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯苯甲酸为原料,先进行醚化,再三氯化铝作用下进行傅-克反应,简洁、高效合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理解释说，给车重新喷漆之前，他们得先把车身毁坏地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星期日，负责发现号轨作人员跟国际空间站接轨前，必须先确定热障起飞时没有损坏。

You should gather yourself together firstly under conditions of great danger.

在极其危险的情况当先控制住自己。

It seems wise to reconnoiter before entering the town.

在进入那城以前, 先侦察一是明智的。

Filter out all the dirt before using the water.

在用水以前先将其中不清洁的东西过滤掉。

Mary scraped the residue of food from the plates before putting them under water.

玛丽在把盘子放入水之前先刮去上面的食物残渣。

There's a special enclosure where you can look at the horses before the race starts.

"这里有一处特备的围场,在比赛前以先看看马。"

Xanthone was efficiently synthesized from o-chlorobenzoic acid first by etherization and then by Friedel-Crafts reaction in the presence of aluminium trichloride.

以邻氯苯甲酸为原料,先进行醚化,再在三氯化铝的作用进行傅-克反,简洁、高效的合成呫吨酮。

The mechanic explained that they would have to make good the damage to the body of the car before they resprayed it.

修理工解释说，在给车重新喷漆之前，他们得先把车身毁坏的地方修理好。

The orbiting Discovery crew on the way Sunday to rewire the International Space Station first had to make sure the shuttle's heat shield(heatshield) wasn't damaged during lift-off.

星，责发现号轨道的工作人员在跟国际空间站接轨前，必须先确定热障在起飞时没有损坏。