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Line is the mark made by a moving point, such as a pencil or brush.
线是由动点构成的，如铅笔或笔刷。
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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 median point, plane, line, or part.
中点，中间平面，中线或中间部分。
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A median point, plane, line, or part.
中点，中间平面，中线或中间部分。
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