在这份作业中，你应该在修改版本中至少使用两笔二手的资源。

In this assignment, you should use at least two secondary sources in the revised version.

youdao

在这份作业中，你应该在修改版本中至少使用两笔二手的资源。

In this assignment, you should use at least two secondary sources in the revised version.

youdao