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1·A friend is a second self.

朋友是另一个自己。

2·One of Zeno's sayings is: A friend is a second self.

芝诺有一句名言是：朋友如同第二个自我。

3·A friend is, as it were, a second self.

朋友就好像第二个自己。

4·A friend is, as it were, a second self!

对啊！朋友，第二个自我。