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

In my experience, decisions moved with the process of risks, mitigation like malaises When the Taliban arrived in the village, it takes 96 hours for an army commander to obtain necessary approvals to act.

以我的经验来看，决定的执行是有一定的风险的,当塔利班分子进入到村子后，一个军队指挥官要花去96个小时来获得必要的批准才能行动。

普林斯顿公开课 - 国际座谈会课程节选

And he's going to have to rectify the circumstances that made his destruction of the earth necessary in the first place.

他不得不修正,他认为有必要毁灭人类的情形。

耶鲁公开课 - 旧约导论课程节选

That it was necessary to stop - for a while - all payments in gold or silver.

VOA: special.2009.01.01

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

Mr.Stevens says a one hundred percent increase in fish farming over ten years is necessary to keep providing for people at the current level.

VOA: special.2011.02.08

Each of these waves is regarded as in some way necessary for the proper construction of a just city.

每一波,在某些程度上,都被视为是真正建立正义之城的必需条件。

耶鲁公开课 - 政治哲学导论课程节选

He said it was healthy and necessary for differences to exist in a country so large.

VOA: special.2009.06.11

Their relationship is necessary but, as we'll see in a minute, arbitrary, and each sign is like that.

这种关系十分必要，但是它又有任意性。

耶鲁公开课 - 文学理论导论课程节选

"I'm pleased that the House has acted with the urgency necessary in passing this plan.

VOA: special.2009.01.31

It isn't necessary for you to grasp his occultism in order to read his poetry well.

但这不是必要的,没必要去理解他的系统,不理解系统也可以读他的诗。

耶鲁公开课 - 现代诗歌课程节选

And it proved that experienced pilots had the skills necessary to fly in space.

VOA: special.2010.07.07

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

It said the government could use force, if necessary,to keep states in the Union.

VOA: special.2009.07.16

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

After completing their studies, Sudanese students are expected to return home with the skills necessary to help deal with the complex causes of conflict in the country.

VOA: special.2009.01.28

For, as Rutherford has shown the assumption of the existence of nuclei, as those in question seems to be necessary in order to account for the results of the experiments on large angle scattering of the alpha rays.

因此卢瑟福,提出了原子核存在的假设，这些关于问题的假设对于,解释阿尔法粒子的,大角度散射是有必要的。

麻省理工公开课 - 固态化学导论课程节选

In April they had agreed to do everything necessary to prevent a collapse.

VOA: special.2009.10.02

Why don't bacteria need a distinct nucleus and that's necessary in a human cell?

为什么细菌不需要单独的细胞核,而对人类细胞则为必需

耶鲁公开课 - 生物医学工程探索课程节选

He felt slaves were necessary in the agricultural economy of the South.

VOA: special.2009.02.05

So it's not just merely the case that in fact we are all going to die; it's a necessary truth that we're all going to die.

所以我们会死去,不仅是一个事实;,我们会死去还是必然的真理。

耶鲁公开课 - 死亡课程节选

But he thought a strong position was necessary in negotiating with Britain.

VOA: special.2009.02.19

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

But others now say this period after the Civil War was a necessary step in creating a different kind of South from the one which had existed before.

VOA: special.2010.02.04

So we'll see in a moment why that's necessary.

我一会儿将了解到为什么这是必须的。

哈佛公开课 - 计算机科学课程节选

Research in a small space is necessary for the clouded leopard.

VOA: special.2010.06.22

Now, I think in certain circumstances it becomes necessary to overlook that unjustness, perhaps condone that injustice as in the case of the cabin boy being killed for food.

我认为在某些情况下,我们需要忽视这种不公平，容忍这种不正义,例如在救生艇里被当作食物的男孩。

耶鲁公开课 - 公正课程节选

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

VOA: special.2009.08.06

In some sense, strictly speaking they shouldn't be necessary because the fact that my specification starts with an assumption, says, hey you, who might call square root make sure that the things you call me with obey the assumption.

在某种意义上严格的来讲,它们不是必要的,因为我已经对假设做了声明,也就是说，如果你要调用我的，求平方根的函数,请确保你传递给我的,参数满足假设条件。

麻省理工公开课 - 计算机科学及编程导论课程节选

In very severe cases, it can even defile some common objects, and in those cases, the source of impurity might have to be isolated or excluded if necessary.

在一些非常严峻的情况中，它会玷污一些普通的事物，在这种时候，不洁之源,也许只能被孤立，严重的话需要驱逐。

耶鲁公开课 - 旧约导论课程节选