We have not been as focused as we need to be on all the various steps that are needed in order to deal with Afghanistan."

VOA: special.2009.02.21

We didn't just need that n, not just the principle quantum number that we needed to discuss the energy, but we also need to talk about l and m, as we did in our clicker question up here.

我们不仅需要ｎ,不仅要这个可以,决定能量的主量子数，还需要ｍ和ｌ,就像我们做这道题这样。

麻省理工公开课 - 化学原理课程节选

Such states, of course, did not need a bureaucracy for there were no vast royal or state holdings that needed management and not much economic surplus to support a bureaucratic class.

国家无需官僚体制,因为没有庞大的皇室家族,和国家财富需要管理,也没多少经济盈余能够维持官僚阶级

耶鲁公开课 - 古希腊历史简介课程节选

"I think that more troops are certainly needed, particularly to do one thing we need to build up the Afghan security forces quickly both the army and the police.

VOA: standard.2009.09.29

Even if that beaker had all the nutrients that skin cells needed they wouldn't survive very well in solution, they tend to need to be stuck to a surface in order to survive.

即使供给它们所有所需的养分,它们也不能在溶液中正常存活,皮肤细胞倾向于贴壁生长

耶鲁公开课 - 生物医学工程探索课程节选