外键可以让您将一张表中的一行与另一张表中的一行相关起来。

Foreign keys allow you to relate a row in one table with a row in another.

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外键是在一张表中出现的一个或多个数据属性；它可以是另一张表的键的一部分，或者干脆碰巧就是另一张表的键。

A foreign key is one or more data attributes that appear in one table that may be part of, or is coincidental with, the key of another table.

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警察事先在复印机里放置了一张写着“他在撒谎”的纸张，每当他们认为嫌疑犯没说实话时，就按下“复印”键。

The message "He's lying" was placed in the copier, and police pressed the copy button each time they thought the suspect wasn't telling the truth.

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