And, following a test, a lot of people write in pencil: don't try to erase something and bring it back and say that, oh, actually, this is what I had because we look at that and go, this is perfect.

还有，在测试的时候，很多人用铅笔：,不要试图擦掉什么，把它带回,说，事实上，这是我的,因为我们看了一下就走了，这很完美。

麻省理工公开课 - 固态化学导论课程节选

So let's start somewhere; what we're going to do is we'll refer back to this other picture, which is why I left it here.

就从这里开始着手吧,我们先来参考一下之前的图像,所以我之前没有擦掉它

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