Gladwell has written four books.

格拉德威尔写了四本书。

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Up to now, she has written four books.

到目前为止，她已经写了四部书了。

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Today, has written four "mood Essay," a good mood.

今天，已经撰写了四则“心情随笔”，心情很好。

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Today, has written four "mood Essay," a good mood.

今天，已经撰写了四则“心情随笔”，心情很好。

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