They are not afraid to tackle the issues or let the sparks fly when necessary.

他们不怕应付这些问题, 必要时也不惜进行唇枪舌剑的激烈争论。

《柯林斯英汉双解大词典》

With any container that you choose, you need to ensure that it allows the water in it to drain when necessary.

对于您选择的任何容器，您需要确保在需要的时候它能够排除里面的水。

youdao

A new system allows a combine harvester, say, to send a call over to a tractor-trailer so the driver can unload the grain as and when necessary.

例如，一种新的系统允许联合收割机向牵引拖车发送呼叫，以便司机可以在必要的时候卸载谷物。

youdao

The law established the idea that the government could control industries, when necessary,for the public good.

VOA: special.2010.05.06

Have we at least found something interesting,necessary, unique to death when we say,Nobody can die my death for me.

我们是否至少找到一些有趣，必要，独特的东西，当我们说“没有人能代替我死亡。

耶鲁公开课 - 死亡课程节选

When they thought it was necessary, they maintained peace by destroying communities and forcibly moving populations.

一旦他们觉得有必要，就会为了维护和平，毁灭其他群体,强制迁移人口。

耶鲁公开课 - 新约课程节选

Lucas will act as the creative consultant, to fill in the blanks when necessary.

FORBES: Move up http://i.forbesimg.com t Move down

The Fed has consistently demonstrated its unwillingness to take the appropriate actions when necessary.

FORBES: Bernanke: 60 Minutes, 2 Big Lies

When necessary, this passageway is kept open using medication in babies with tricuspid atresia.

CNN: Tricuspid atresia