While going out, he stumbled over the threshold and nearly fell over his face.

他出去时, 在门槛上绊了一下,几乎跌了个狗吃屎.)-个别事件.

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School students should be in this muddy walking track, and sometimes fall " it! "

学生上学时都要在这泥泞的小道上行走, 有时还会跌得 “ 狗吃屎 ” 呢!

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