He said the first great fact was that laws were not necessary to keep slavery out of California and New Mexico.

VOA: special.2009.03.19

The fact that I have this star here, this star here, this star here, is really just 'cause I'm a little anal and it looks pretty to make a little box out of everything but it's not strictly necessary.

事实上大家可以看到，这有颗星，这有颗星，这有颗星，其实是我手痒,这看起来像是用*围成个框，把它们包围起来,其实这是完全没有必要的。

哈佛公开课 - 计算机科学课程节选

we're looking for something that's true,necessary,interesting and, if not unique to death,at least not true of everything.

我们要寻找的是真实，必要，有趣的，而且就算不是死亡独有，也不能是普遍事实。

耶鲁公开课 - 死亡课程节选

"What is necessary in this case is a collective effort, not only by the researchers and the people on the ground, but also the donor community, because controlling those two diseases can go a long way in improving people's food security and livelihoods in Sub-Saharan Africa."

VOA: special.2009.09.21

Hardly. Does it not require those qualities of self-control, discipline, and restraint necessary to achieve success here?

不！难道不需要那些特质吗,诸如自控，纪律与克制等，以求在此取得成功？

耶鲁公开课 - 政治哲学导论课程节选

That violence brought an overnight curfew to Port Gentil which was repeated Friday and will continue, Ndongou says, "as long as necessary if calm does not prevail."

VOA: standard.2009.09.05

Don't put in extra bells and whistles if it's not necessary.

不必要的话不要放进去,多余的铃声和口哨声。

麻省理工公开课 - 固态化学导论课程节选

"The lack of access is also affecting the ability of the Afghan population to obtain the necessary medical assistance and basic services, which they need,and which they are increasingly not getting,"

VOA: standard.2009.08.07

Why? Because good will and idealism, while necessary,they are not sufficient.

为什么呢？因为美好的意愿和理想主义，虽然必要，但却是不够的。

哈佛公开课 - 幸福课课程节选

We've extrapolated that people have property rights and so whether or not it would be a good thing or a nice thing or even a necessary thing for the survival of some people, we don't see that that justifies the violation of the right that we've logically extrapolated.

我们已经推出人们有财产权,所以，就算是为了做好事，做善事,甚至是为了让某些人活下去而必须做的事，那也是不能证明，侵犯这些推定的权利,就是正当的。

耶鲁公开课 - 公正课程节选

Here, too, gets a little ugly and this is why I tend not to like this construct, at least in C, but sometimes it's necessary or it's the simplest way to achieve this goal.

这里也有点难看的，这也是为什么我,不太喜欢这个结构，至少在C语言中，但是有时它是必须的,或者它是达到目标最简单的方法。

哈佛公开课 - 计算机科学课程节选

If,when we interpret the claim everyone dies alone, that just ends up being a slightly pretentious way of saying everyone dies, we might say,oh yeah,that is true and it is a necessary truth, but it's not especially surprising.

如果我们对每个人都孤独而死的诠释，只是装模作样地说明人终有一死，那我们会说，这是真理，也是必要的，但并没有什么好惊奇的。

耶鲁公开课 - 死亡课程节选

Then the duke judged that such excessive authority was not necessary, because he feared it might become hateful and he set up a sort of a civil court in the middle of the province with the most excellent president where each city had its advocate.

然后君王判断,这样过度的威信是不需要的，因为他害怕那可能会变成仇恨,他在该省区中心,设立了一个类民事法庭,并派出最优秀的大臣,让每一座城都有自己的律师。

耶鲁公开课 - 政治哲学导论课程节选