It's not necessary to reply to a mass email sent to numerous recipients.

没必要回复群发邮件。

A dynamic government is necessary to meet the demands of a changing society.

一个有活力的政府必须适应社会的改变。

Is it necessary to say " ever" ?

一定要说“ever（曾经）”吗？

We convinced him that it was necessary to stay.

我们使他相信有必要留下。

If necessary to be dishonest, be dishonest.

在必要的时候 他可以不诚实。

Is it necessary to be so intimidating?

有必要这么吓人吗？

For them it is necessary to get support.

对他们来说，获得支持是必要的。

It's not necessary to be the same.

没有必要相同。

He said that's necessary to fight climate change.

他说，这对我们应对气候变化是很有必要的。

'Not necessary to fall down, 'the computer said.

“不必趴下，”电脑说。

Physical exercise is necessary to reduce catatonic effects.

为了减少紧张症的影响，体育锻炼是必要的。

Additional doses may be necessary to maintain reversal.

可能需要额外的剂量来维持逆转。

It may be necessary to do something desperate.

可能有必要做一些孤注一掷的事情。

" Necessary? No, I should not say that it is necessary to kill."

“一定？不，我认为不一定要杀人。”

I did whatever was necessary to make it stop.

只要能让它停下 我做什么都可以。

Water is necessary to keep them in good shape.

水是它们保持良好身体状态的必需物质。

Is it necessary to say anything?

还有必要对外说什么吗We need to distance this administration 我们需要撇清本届政府与她？

It's not necessary to whisper, Harry.

没有必要压低音，Harry。

Which is absolutely necessary to make it work on a global scale.

而这些方面，是绝对有必要的在全球范围内运作起来的。

It's necessary to wash hands in the right way.

正确洗手是必要的。