It is necessary that one should obey the law.

一个人遵守法律是必要的。

They were plotting how to obtain the necessary information.

他们正在策划如何获取必要的情报。

We shall have to trim away the unnecessary parts of the spending.

我们必须削减不必要的开支。

Vulgarity is a very important ingredient in life.

庸俗是生活中非常必要的作料。

In certain conditions,answering back sarcastically is necessary.

在某种情况下,讥是必要的。

Elbow pads and knee pads are essential on a skateboard.

滑滑板时带护肘和护膝是必要的。

It is sometimes necessary to indulge a sick child.

迁就一个生病的小孩有时是必要的。

Has she the wherewithal to pay for the trip?

她有必要的钱来支付旅行吗？

Don't labour the reader with unnecessary detail.

不要用不必要的细节使读者疲倦。

There’s no sense in taking unnecessary risks.

做不必要的冒险毫无意义。

The court is ineffective because it lacks the necessary enforcement machinery.

法率低是因为缺乏必要的执行机制。

His films are full of gratuitous violence.

他拍的影片充满了不必要的暴力。

The mechanic made the necessary adjustments to the engine.

机械师对发动机作了必要的调整。

Food subsidies are necessary for keeping down the price of dairy products and bread.

食品补贴对控制乳制品和面包的价格是必要的。

Thus adequate proportion of estrogen and progesterone is important for the decidualization.

合适的雌孕激素比例对蜕膜化的维持是必要的。

The situation brings home to us the need for drastic preventive actions.

这种情况使我们深切地感到采取极端的行动是必要的。

Chairman refused to commit himself on the controversial subject before making due investigations.

主席拒绝在作必要的调查研究之前对这个有争论的问题表态。

Thousands of children in the world today suffer needlessly.

当今世界有成千上万的儿童遭受着不必要的痛苦。

Except for what he spent on haircuts,books and daily necessities he never wasted a penny.

除了理发、买书和必要的日用品之外,他从不浪费一分钱。

The situation brings home to us the need for drastic preventive measures.

这种情况使我们深切地感到, 采取坚决的预防措施是必要的。