提供了视图定义后，可以创建由4个列组成的元数据对象，并指定一个列为主键以进行以后的工作。
Given the view's definition, you created a metadata object consisting of four columns and designated one column as the primary key for purposes of your work.
本公司的工艺礼品以陶瓷画框系列为主。
The main product is ceramic frame series which is the new product with huge potential in the market.
湘东南玄武质岩石包括碱性玄武岩和拉斑玄武岩两个系列 ，以碱性玄武岩系列为主。
The basaltic rocks in Southeastern Hunan Province include alkali basaltic series and tholiitic basaltic series, the alkali basaltic series is in great number.
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