Besides, the material type is a key reference factor in selecting electronic resources.

资料类型是选择电子资源的重要参考因素。

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Here we see that the mapping for Customer's Address field links the two halves of the relationship together with the foreign key reference in the table schema file.

这里我们看到Customer的Address字段映射用表模式文件中的外键引用将关系的两部分链接在一起。

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It is incomplete if it omits key ideas, makes vague reference to key ideas, or demonstrates limited development of important information.

如果它遗漏了关键思想，含糊其辞地提及关键思想，或者它对重要信息的拓展不够充分，那它就不完整。

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Already, thousands of pictures have been deposited in the Herschel archive, which is set to become a key reference source for decades into the future.

BBC: Herschel space telescope to go blind

The key here is the reference to 2008.

FORBES: Look Out Bears, The Bulls Will Rule September

Mr Conroy was quoted by the Associated Press as saying the terms of reference were under discussion with the Greens, a key partner in Julia Gillard's minority coalition government.

BBC: Australia plans media inquiry after UK hacking scandal