Indexes are defined on all primary and foreign key columns to support efficient joins between the 12 tables.

全部主键和外键均定义了索引，来支持12个表之间有效的结合。

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This is a critical time for suppliers to reassure their key customers in foreign markets of their continued commitment to support.

对供应商而言，这是一个保证他们在海外市场的主要客户继续支持承诺的关键时刻。

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Participation by the Saudi foreign minister was a key goal of the United States to show Arab support for the conference, but until Friday, the kingdom had balked at saying whether it would attend and at what level.

NPR: Expert Looks at Topics on Tap for Mideast Meeting