切记，对于要工作的表之间的关系而言，关系的一的方面的主键字段一定要与关系的多的方面的外键字段相匹配。

Remember that for relationships between tables to work, the primary-key field on the one side of the relationship must match up to the foreign-key field on the many side of the relationship.

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内核提供了一种称为内核键的抽象，它映射到多对一的硬件键。

The kernel provides an abstraction called kernel keys, which map many-to-one onto hardware keys.

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同时，工具不会收集某个键的统计数据，例如多列和分布统计数据。

At the same time, the utility does not collect certain key statistics, such as multi-column and distributed statistics.

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The center of excess negative charge on all of the dipoles is at the very center of the molecule.

多出来的键,的负电荷中心都集中在,分子的正中间。

麻省理工公开课 - 固态化学导论课程节选