The accord states that limiting temperature increases to no more than two degrees Celsius is necessary to stop the worst effects of climate change.

VOA: special.2010.01.19

Fate will permit no apocalypse before its time, before the necessary and painful steps that have to lead up to the Last Judgment.

命运在来之前不会允许人们去启示别人，必须要自己去经历必要而又痛苦的那几步,才能走向最终的审判。

耶鲁公开课 - 弥尔顿课程节选

So the reward helps, but the reward is in no sense necessary.

因此，奖励有所帮助，但并非必须。

耶鲁公开课 - 心理学导论课程节选

The complex documents and mathematical work were no longer necessary.

VOA: special.2010.07.14

Then also you'll be asked to do identifying information if you print it out from the program itself, but if you go up to your web browser print option and print from that particular thing then you can do it and no identifying information will be necessary.

如果你想直接从网上打印分析结果,就得提供个人信息,但是,如果你用浏览器中的打印选项,只打印营养分析结果,你就可以打印文件而无需提交个人信息

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

But no candidate got the necessary majority.

VOA: special.2009.03.12

The philosopher Spinoza thought that ... if we could only recognize the fact, what he at least took to be the fact, that everything that happens in life is necessary, then we'd get a kind of emotional distance from it; it would no longer upset us.

哲学家Spinoza认为,如果我们能够认识到这个事实，至少他认为这是事实，即生活中的一切事情都是必然的，那么它对我们的情绪影响就比较少;,它不会再让我们感到痛苦。

耶鲁公开课 - 死亡课程节选

Speaking via Skype,she says no. "I think further studies will be necessary to show whether the differences we've demonstrated depending on delivery mode of babies when they first emerge into the world actually carry over time, and whether those differences might contribute to health outcomes."

VOA: standard.2010.06.30