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Requirements for industrial production of social cooperation, forming a rich product line.
工业生产所需的社会合作，形成了丰富的产品线。
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A line segment forming part of the perimeter of a plane figure.
形成一个平面图形的边界的线段。
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A line segment forming part of the perimeter of a plane figure.
形成一个平面图形的边界的线段。
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