... parallel straight frame 平行直梁式车架 parallel straight lines 平行直线 parallel strip 平行带 ...
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pencil of parallel straight lines 平行直线束
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Parallel straight lines are straight lines which, being in the same plane and being produced indefinitely in both directions, do not meet one another in either direction.
平行直线是在同一平面内的直线，向两个方向无限延长，在不论哪个方向它们都不相交。
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