For example, a product description page might draw information from your e-commerce catalog database.

例如，产品描述页面可能会从电子商务目录数据库中提取信息。

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Its head of new media, Sue Macmillan, has assiduously built up an E-mail database.

新媒体首脑Sue Macmillan辛苦创建了一个邮件数据库。

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There maybe many layers in a database, e. g. soil type, elevation, land use, land cover.

一个数据库中可能有许多层，例如土壤类型、海拔、国土利用、国土覆盖。

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There maybe many layers in a database, e. g. soil type, elevation, land use, land cover.

一个数据库中可能有许多层，例如土壤类型、海拔、国土利用、国土覆盖。

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