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.

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。

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The Development Secretary responded that the overlap with British security interests is so natural it might as well be coincidental, because these conflict-ridden states ARE poor states.

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It seems more than just coincidental that the two conferences with the lowest average football revenue would also be the two conference with the highest reliance on student activity fees.

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