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Your eyes can’t see the black hole because there is no light from it.

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合作小组可以2个人,4个人,但最好不要三个人。

函数不能嵌套定义,但可以嵌套调用.

I really enjoy the ______ and beauty of his writing. (pure, purity )

对于年龄段比较低的学生,教师需要适当的简化小组调查任务的复杂性。

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