Because we don't mind giving you milk, but if we have to give milk for the cat as well, it's a little bit too much. It's OK that we give, but everyone else is not the same.
于是又有一些好心人来告诉他：「你不能这样为了这只猫而得经常出去托钵牛奶和食物啊，只要养一头牛就好了我们是不会介意供养牛奶给你啦，不过，如果还要供养你的猫的话，那就太多了一点。
OK, well, it's not an actual TV.
好吧，这其实并不真的是电视。
OK, and that surface integral, well, it's not for the same vector field.
这个曲面积分，不是同一个向量场。
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