Now, if you stare long enough at that equation, you'll actually see that, yes, we know that it had to be like that. But, see, so these are useful ways of trying to guess what the graph looks like.
如果你认真考虑那个方程，你会发现这个事实，是的，我们知道它应该是这样，看到了吧，这些是猜测函数的图像的有用的方法。
Listen to these interesting job descriptions and try to guess what the people who do these jobs are called.
听这些有趣的工作介绍并猜一猜从事这些工作的人被称作什么。
These photos are the people in the No. 13 subway, the facial expression_r is flat, let us can not help guess what takes place in their life?
这是在13号地铁抓拍到的人，一脸的迷茫和无助，让人不禁猜想在他的生活发生了什么?。
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