我发现你可以，比如说，通过观察一个人的说话或者挥手的方式来了解他。
I found out that you could, for example, discover things about a person by the way they talk and move their hands.
面部表情是一种有效的情绪显示器，通过观察一个人的面部表情，可以了解此人现在的情绪状态。
Facial expressions are significant biological indicators of emotion. We can realize one's emotion state according to the facial expression.
通过观察一个人所读的书，就能了解他的个性。就像观察他身边的朋友一样可以知道他的性格一样。
A man may usually be known by the books he reads as well as by the company he keeps.
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