Work area of oil extraction is a primary unit in petroleum production.

采油工区是原油生产的一线单位.

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A file is the primary unit of storage on your computer.

文件是计算机数据存贮的基本单位.

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Curriculum is a primary unit for realizing training goal.

课程是实现培养目标的基本单元.

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Use packages as the primary unit of release and distribution.

应该将包作为软件版本发布的基本单元.

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