形成图像的电子通过了这个样品，因此必须准备和检查单个的切片。

The electrons that form the image pass through the sample, so the individual slices have to be prepared and examined.

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玩电子游戏可以帮你为将来的职业做准备，比如飞行员。

Your video game playing could be preparing you for a career such as a pilot.

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电子商务准备的是可以在互联网上看的目录，而不是实体的目录。

Instead of a physical catalog, e-commerce arranges for catalogs to be visible on the Internet.

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So whether we finish it today, or more likely when we finish it up on Friday, once we get passed isoelectronic atoms, that's it, that's all you need to study for this first exam.

因此，我们也许今天讲完，或者更有可能周五讲完，无论如何，就到我们讲完等电子原子为止，这是你们第一次考试所需要准备的全部内容。

麻省理工公开课 - 化学原理课程节选