It is necessary to exercise caution when making commendations.

做推荐时有必要谨慎一些。

Defensibility is a necessary character of excellent dwelling environment.

可防卫性居住区环境质量的必要组成方面。

They were plotting how to obtain the necessary information.

他们正在策划如何获取必要的情报。

Don't labour the reader with unnecessary detail.

不要用不必要的细节使读者疲倦。

You may find it necessary to readjust the wheels from time to time.

你会发现不时调整有必要。

You must understand the necessity of education.

你必须懂得教育的必要性。

The necessity for nuclear nonproliferation seems clear.

防止核扩散的必要性似乎清清楚楚。

At a pinch it can be used as a weapon.

必要时可把它当作武器。

The company needs to pep up its image.

这家公司有必要改善其形象。

We were obligated to attend the opening ceremony.

我们有必要参加开幕式。

It is necessary that one should obey the law.

一个人遵守法必要的。

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。

There is no need to think that you are sentenced to a lifetime of unhappiness.

没必要认为你就注定一辈得不到幸福。

His films are full of gratuitous violence.

他拍的影片充满了不必要的暴力。

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

我们必须削减不必要的开支。

Should make the patient maintains lukewarm thaw quiet, can give when necessary tranquillizer and aconite.

应使病人保持温暖和安静，必要时可给镇静剂和止痛剂。

Some parents worry unnecessarily about their children.

有些父母不必要地为孩担心。

There’s no sense in taking unnecessary risks.

做不必要的冒险毫无意义。

There is no cause for concern, for the windstorm was not too serious.

那场风暴不太厉害,没必要担心。

Complexity of aluminium electrolyser production is analyzed, and motivation of production intelligence is explained.

摘要分析了铝电解槽生产的复杂性，提出生产智能理念的必要性。