An extraordinarily important study skill is knowing how to mark a book.

知道如何在书上做标记是一个非常重要的学习技巧。

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You shouldn't mark a book which isn't yours.

你不应该在别人的书上做记号。

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You shouldn't mark a book which isn't yours.

你不应该在别人的书上做记号。

youdao