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The difficulty of this course consists in the fact that it teaches what you already know.
这门课程的难度，就在于,传授的都是你们已有的知识。
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$firstVoiceSent
- 来自原声例句
The difficulty of this course consists in the fact that it teaches what you already know.
这门课程的难度，就在于,传授的都是你们已有的知识。
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