政策毕竟是政策，但是你可以进行交换，你可以用学分来换取下个学期的书。

Policy is policy after all, but you can make an exchange and you can use the credit for your books for next semester.

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根据巨头阿里巴巴2018年的一项调查，二手书市场在去年蓬勃发展，因为越来越多的中国人倾向于在网上交易或交换他们的二手书。

According to a survey by giant Alibaba in 2018, the market for the second hand book was booming last year as more Chinese tend to trade or exchange their used books online.

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这个规范试图为基于XML的需求说明书引入一种通用的模型和数据交换格式。

This specification tries to introduce a common model and data exchange format for requirement specifications based on XML.

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