在我们进行下一步并开始除草之前，我们花了一些时间思考它建在哪里效果最好。

Before we went ahead and dug up the grass, we spent some time thinking about where it would work best.

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进行下一步之前，保存和编译两个类。

Save and compile the two classes before continuing.

youdao

现在我们进行下一步，有两个破坏的键。

And now we'll go to the next one, which could have two broken bonds.

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Now let's do the next step which is a force balance.

现在我们进行下一步，假设。

麻省理工公开课 - 固态化学导论课程节选