We can know that speaking language is a very interesting thing, there are many ways to express emotions to each other, we can usually observe the face of others to know other people's emotions, emotions have many expressions do not have to speak the way to express, body language can also let the other side know your joy and sorrow, as we have previously given, When we see our friend's face looks bad, we don't have to ask to know that he's in a good mood today.
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