This is a usual thing. (在一所大学里，有一个欧洲人和一个独眼龙拿着有用的工具沿着一条单行道行走，这是件平常的事。) 不定冠词a(an)的用法A. 不定冠词a(an)用于单数可数名词前。
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In a university, a European and a one-eyed man walk along a one-way road with a usual tool. This is a usual thing. .
在一所大学里，有一个欧洲人和一个独眼龙拿着有用的工具沿着一条单行道行走，这是件平常的事。
In a university, a European and a one-eyed man walked along a one-way road with a useful thing. This is a usual thing.
在一所大学里，一个欧洲人和一个独眼龙拿着一件有用的工具沿着一条单行道走着。这是一件平常事。
This indeed is a serious thing, but as usual, I think, most of the world has overreacted to it.
这确实是一件严重的事情，但和往常一样，我觉得，世界上绝大部分国家对此反应过度了。
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