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Parallel lines are, by definition, lines on the same plane that never join.
按照定义，平行线是在同一平面上永不相交的线。
youdao
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Parallel lines are, by definition, lines that never join.
根据定义，平行线是永不相交的直线。
youdao
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Parallel lines, by definition, never join.
根据定义，平行线永远不会相交。
youdao
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Parallel lines, by definition, never join.
根据定义，平行线永远不会相交。
youdao