Farmers know that it is necessary to make hay while the sun shines.

VOA: special.2010.01.31

It is necessary, he says, for the prince to know well how to use the beast and the man, he writes.

他说，君主有必要清楚的知道,怎样去利用禽兽和人类。

耶鲁公开课 - 政治哲学导论课程节选

For him, and I quote him, "Fortune is a woman and it is necessary to hold her down and beat her, and fight with her."

他认为,"命运就是女人,必须控制并将她打倒在地,与其斗争"

耶鲁公开课 - 古希腊历史简介课程节选

Mr.Obama says it is necessary to end taxpayer bailouts of private companies and make financial deals more transparent.

VOA: standard.2010.04.24

Yes, I do believe it's theft but perhaps it is necessary to condone that theft.

我确实认为这是盗窃,但也许我们有必要容忍它。

耶鲁公开课 - 公正课程节选

He said a lot of misinformation is being spread by critics of reform, adding that it is necessary to clear the air.

VOA: standard.2009.08.11

And what we saw last time is that this was necessary to make things work, this part of it in particular.

上节课我们讲,这是对外做功的必要条件，特别是这个部分。

麻省理工公开课 - 热力学与动力学课程节选

He says he believes it is necessary to let North Korea know having nuclear programs will prove to be a bigger disadvantage than not having them.

VOA: standard.2009.05.26

Why is it necessary to rend something, to make it soul or whole? Is it necessary?

为什么要撕破某样东西，它才能完美呢，这有必要吗？

耶鲁公开课 - 现代诗歌课程节选

"That is why I will send our servicemen and women into harm's way only when it is necessary and ensure that they have the training and equipment they need when they enter the theater of war,".

VOA: standard.2009.05.23

Probably the best answer is our body is worn out during the day and sleep is necessary to put it back into shape.

最佳的答案应该是,一天下来，我们的身体已经疲惫了,有必要进行睡眠，以恢复状态。

耶鲁公开课 - 心理学导论课程节选

It is always a good idea to keep a lot of necessary supplies in the home even before winter begins.

VOA: special.2010.01.05

We don't have an enormous difficulty grasping them, and it doesn't seem to me that our capability of grasping irony is founded on a necessary, underlying agreement.

我们在理解时不会用很大困难，而且我认为，我们理解讽刺的能力,是建立在必要的，潜在的共识之上的。

耶鲁公开课 - 文学理论导论课程节选

But it is not necessary for me to praise my superior.

VOA: special.2010.01.24

As completely as was possible and is necessary, would you choose to do it?

如果完全可能而且必要，你会这样做吗？

麻省理工公开课 - 媒体、教育、市场课程节选

It is not necessary. It puts us in the wrong.

VOA: special.2009.08.06

Is it because necessary conditions for this high ? growth rate just aren't there in India?

是因为印度并没有促进其经济,高速发展的必须因素吗？

普林斯顿公开课 - 国际座谈会课程节选

This he says,is necessary, and recalls that special housing was built for this brigade, where it can continue to serve.

VOA: standard.2009.04.16

Because when we see that something is just necessary, we-- it reduces the sting of it.

因为当我们认识到有些事是必然的-,它便感少了我们对它的痛苦。

耶鲁公开课 - 死亡课程节选

The admiral said it should be clear pretty quickly whether President Karzai is willing and able to take the steps necessary to fight corruption.

VOA: standard.2009.11.04

This is necessary, it's hard to find holes in a Nobel Prize worthy idea.

这是很必要的，在一个获得诺贝尔的想法中,很难发现漏洞。

麻省理工公开课 - 化学原理课程节选

If that is what it takes to bring JAL back, he must convince employees that it is a necessary step for the company's future success.

VOA: standard.2010.02.01

How is it that some people came to acquire this capacity for rational self-control that is necessary for freedom ? and others seem to lack it?

为何有些人,会拥有这种理性自控的能力,那也是自由的必备条件,但有些人却似乎不具备这种能力？

耶鲁公开课 - 政治哲学导论课程节选

Grayson says that while Felipe Calderon's campaign against the powerful drug lords is a necessary effort to protect the nation from criminal enterprises, it will not end narcotics trafficking.

VOA: standard.2009.06.09

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

I won't risk your lives unless it is absolutely necessary.

VOA: standard.2009.10.26

If people are on the verge of dying, perhaps it is necessary to overlook that injustice, but I think it's important to keep in mind that we're still committing injustice by taking people's belongings or assets.

如果人们在死亡边缘挣扎，也许忽视这样的不公平是必要的，但我认为即使这样，我们依然要铭记,我们的行为不公正,这是在占有他人的财物或资产。

耶鲁公开课 - 公正课程节选

"It is a promise that as long as I am your Commander in Chief, I will only send you into harm's way when it is absolutely necessary, and with the strategy, the well-defined goals, the equipment and the support you need to get the job done,"

VOA: standard.2009.05.22

It is a claim already, and as you've seen in Aristotle, towards the end of the history of the free polis, it is something necessary for mankind.

如你在亚里斯多德那里看到那样,在临近自由城邦历史的末期,这已经成为了一种宣言,这对人类来说是不可或缺的

耶鲁公开课 - 古希腊历史简介课程节选

All he tells us is that we are the polis animal by nature and that to achieve our ends, it will be necessary to live in a polis.

他只说到,我们是天生的城邦动物,为了达成目标，必需要住在城邦之中。

耶鲁公开课 - 政治哲学导论课程节选