He created what was required to do that, from the Aqua-Lung, better known by the acronym scuba, to submersibles.

VOA: standard.2010.06.18

And we had the similar statement by Kelvin about the heat engine that required that some heat gets dumped into a cold reservoir in the process of converting the heat from the hot reservoir into work.

相同的陈述,同样的有开尔文表述：,把热量完全从高温热源,转移至低温热源的过程中,必然有功的输出。

麻省理工公开课 - 热力学与动力学课程节选

Now this is a good place to start, because we are very familiar with ionization energy, we've been talking about it it's that minimum energy required to remove an electron from an atom.

现在这是一个开始下面内容的好地方，因为我们已经很熟悉电离能了，我们从很久以前就一直在讨论,它是从一个原子中,拿走一个电子所需要消耗的最低能量。

麻省理工公开课 - 化学原理课程节选

A 218 vote majority would be required but Democrats have faced concerns from moderates and conservatives within their own party.

VOA: standard.2009.09.10

A creature is required who is distinguished in certain ways from other animals.

是一种对之有所求的创造物,他在某些方面与其他动物不同。

耶鲁公开课 - 旧约导论课程节选

Nash says U.S.forces are extremely mindful of the importance of abiding by the security agreement that required U.S.troops to withdraw from Iraqi cities by July.

VOA: standard.2009.08.06

So let's think about the energy required now to remove a 2 s electron, let's say we're removing it from boron plus 1 versus neutral boron.

那么让我们来想一想,拿走一个，2，s，电子所消耗的能量，假设一个是从正一价硼离子中拿走1,另一个是从中性硼原子中拿走。

麻省理工公开课 - 化学原理课程节选

Also,like the House bill, nearly all Americans would be required to purchase some form of insurance, while lower-income Americans would receive help from federal government subsidies.

VOA: standard.2009.12.24

Racist laws required African Americans to drink from separate public drinking fountains, climb back stairs to sit in the balconies of theaters, and wait in much smaller rooms at bus and train stations.

VOA: standard.2010.03.04