It takes years to gain a mastery of Japanese.

掌握日语要花几年时间。

Russian is a diffcult language to master.

俄语是一种难掌握的语言。

I’m trying to come to grips with Russian grammar.

我正在努力掌握俄语的语法。

Can you be master of your destiny?

你能掌握自己的命运吗?

The elements of physics are difficult to grasp.

物理原理是很难掌握的。

He has a great number of English idioms at command.

他掌握的英语成语。

The information in my possession is strictly confidential.

我掌握的情报是绝对机密的。

The teacher quizzed the pupils on the multiplication tables.

老师测试学生们对乘法表的掌握。

His timing when he volleys is so good.

他截击空中球的时机掌握得很好。

The children progressed in the acquisition of basic skills.

孩子们在掌握基本技取得进步。

The bowler judged it well, timing the ball to perfection.

投球手判断准确，对球速的掌握恰到好处。

We are on the scent of an important discovery.

我们已掌握一条可能导致重要发现的线索。

The basic vocabulary of a language is those words that must be learnt.

一种语言的基本词汇即必须掌握的词语。

It was a difficult concept to grasp, but Sam latched on very quickly.

那是个难掌握的概念，但萨姆很快就理解。

According to facts in my possession he can't possibly be guilty.

根据我所掌握的事实, 他是不可能有罪的。

It's not difficult to understand this world when you mastered the internal relations of things.

掌握事物的内部联系你就不难理解这个世界。

To learn the process of making barbola fish.

使学生解剪贴画的步骤，掌握剪贴画的制作。

They will be examined on their knowledge of Spanish.

他们将参加考试, 检查他们掌握西班牙语的情况。

The indication of expectant treatment should be taken restrictively in slight cases.

对病情轻,表现不典型的病例,必须严格掌握保守治疗的指征。

To master the regulation of thyroid hormone secretion including hypothalamas-pituitory-thyroid axis，nervous regulation and the autoregulation.

掌握甲状腺功能的调节，包括下丘脑—腺垂体—甲状腺轴和自身调节。