你最好保留着这样书，因为他会很有用的翻译：You'd better keep this book, because he will be useful 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

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You'd better keep this book, because he will be useful

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It would be best if you keep such books because he will be very useful

You'd better keep this book, because he will be useful