到底音乐里的什么如此有用，当我们首次遇见某人时，我们能从另一个人对音乐的喜好得出什么信息。
What is it about music that's so useful when we first meet someone and what kind of information can we extract from the music another person likes?
当然我怀疑来自与某人的快乐策略是否对其他人有用。
Of course I wonder if happiness tactics that come from someone elsecan ever stick.
他极少问自己是否喜欢某某人，他只是按照某人是否对自己有用来估价他。
He seldom asked himself whether he liked such and such a man: he esteemed a man according to whether he was useful to himself.
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