Change the from of the word if necessary.

必要时改变单词。

C) Opting for nuclear energy when necessary.

C) 必要时选择核能。

First of all, you can shorten the introduction if necessary.

首先，必要时可以缩短引言。

Break them if you have to.

必要时可以击碎车窗。

Let that boil for 20 minutes and add more water if needed.

煮20分钟，必要时再加点水。

A supporting network of aircraft cable can be used if necessary.

必要时，可以使用飞机支承网。

We will need to be ready to move again when necessary.

我们需要做好必要时再次行动准。

You may continue to contact me whenever you feel the need.

有必要时，你可以再和我联络。

And it's clear that it's ready to start broadening its fight if it needs to.

显然，它准在必要时扩大其战斗范围。

655. In case of necessity, necessary session can be held on the vessel.

必要时，必需开庭可在船舶上进行。

Be careful, you shouldn't do this unless it's really necessary.

要注意，只有在真正必要时你才能这么做。

You accept it, cry it out if you need to, and then force a smile.

你接受现实，必要时哭出来，然后强颜。

So officials say they'll loosen up, you know, the eligibility when that's necessary.

所以官员们表示，他们将在必要时放宽资格。

Just remember, this is something you can only use if it's really necessary.

只是要记住，只有在真正必要时才能使用这种方法。

Another safety protocol is insuring humans can take control when necessary.

另一个安全协议就是确保人在必要时可控制车辆。

Could you quote them to me, so I can double-check them as the need arises?

您可以给我举出来，让我必要时加以检查吗？

My first grammar tip is to avoid contractions where necessary.

我第一个语法建议是必要时避免使用缩略。

He says the chemicals should be used more sensibly, or, in other words, only when necessary.

他说应该在必要时合理这种杀虫剂。

There are even signs that authorize " deadly force" when necessary.

甚至有迹象表明，在必要时被授权使用“致命武器”。

When necessary, they can focus it like a laser beam; when not, creative types immediately recharge their batteries.

有必要时，他们就能像激光一样专注；没必要时，富有创意人就会立刻开始充电。