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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Nowadays almost every countries has taken the social music education as a key reference in measuring a country's ethnic and cultural qualities of the music and even the degree of civilization.

如今衡量一个国家民族的音乐文化素质甚至是文明程度，都要把社会音乐教育的实施情况作为重要的参照标准。

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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

According to prosecutors, he transferred any Russian reference from his work computer to a USB key, sharing it with a Russian handler through email.

BBC: Canada naval spy apologises to family before sentencing