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Use to indicate a datum target area, line or point.
用于指示基准目标区域、线条或点。
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A line of punch positions parallel to the Y datum line of a punch card.
基准线平行，在地平面或者基准平面上。
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An united space datum line has been given.
给出统一的空间基准线。
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An united space datum line has been given.
给出统一的空间基准线。
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