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Parallel definition of primary school mathematics
(1) Two lines that never intersect in the same plane are parallel to each other, one of which is parallel to the other.

(2) Draw three lines from Xiaoming's home to a straight road nearby, and measure the lengths of these three lines as 136 m, 120 m and 154 m respectively, and one of them is a vertical line segment. Distance from Xiaoming to highway120m.