你最好保留着这些书，因为它们会很有用的翻译：You'd better keep these books because they are 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 these books because they are useful

You should better retain these books, because they can very useful

It would be best if you keep these books because they will be very useful

You'd better keep these books because they are useful