远古人类会发现在缺少某种形式的机械辅助的情况下，这一过程是不可能实现的，这些辅助对他们来说不可或缺。

These aids would have been indispensable to very early people who would have found the process impossible without some form of mechanical aid.

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如果你仔细观察，你会发现这是三种不同形式的碳的混合物。

If you look more carefully, you will find that this is a blend of three different forms of carbon.

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1752年，本杰明·富兰克林将一把钥匙系在风筝上，在暴风雨中放飞，他发现了闪电是电的一种形式。

In 1752, Benjamin Franklin tied a key to a kite and flew it in a storm to find out that lightning was a form of electricity.

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But, if you look more carefully, you will find that this is a blend of three different forms of carbon.

但是，如果你们再认真一点，会发现,它是三种形式的碳的混合物。

麻省理工公开课 - 固态化学导论课程节选

So in our first structure, we would find for the nitrogen we have a formal charge 5 minus 4 minus 2, because we're starting with 5 valence electrons, so that is a formal charge of minus 1.

那么在我们的第一个结构中，我们发现氮的形式电荷量是五减去四4,再减去二，因为我们开始有五个价电子，因此它的形式电荷量是负一。

麻省理工公开课 - 化学原理课程节选

There you would really think the formalists are on thin ice.

你会发现形式主义者的论点在这里如履薄冰。

耶鲁公开课 - 文学理论导论课程节选