Well this third picture you can't probably see too much about but you probably recognize what it is, right?
第三张图可能你们没见过了,但你们能认出这是什么,对吧
If there was a time to go too fast it was probably last time, because it turns out this is something that's covered well in the textbook, so it's covered in chapter six of the textbook.
如果真有哪次讲得太快,可能就是上次,因为这些内容,已经在课本上写得很清楚了,就在课本的第六章
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