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Of course lots of kids read dirty books in their rooms and hide them under the mattress.
当然很多孩子在他们的房间里看黄书，而且会把它们藏在床垫子底下。
《柯林斯高阶英汉双解学习词典》
3、
We send advance copy of the new course books to the teacher and the student who use it.
我们先送了几册新教科书给要用书的老师和学生们。
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In the normal course of event, accounts receivable are collected when due and from the books.
在正常情况下, 应收账款到期时收集和删除书籍.
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