一个学中文的外国人在刚开始和中国人打交道的时候，他的语言水平会受到无形的考核。

When a foreigner studying Chinese started deal with Chinese people, he would have an invisible exam on his language proficiency.

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刚出国或者刚开始与老外打交道的人经常会犯一些很低级的错误，根源就在于此。

At the beginning when a person go abroad or get contacts with foreigners, they often make some stupid mistakes. The fundamental reason lies here.

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