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。
Parallel lines are lines that never join.
平行线是永不相交的线。
Parallel lines are, by definition, lines that never join.
根据定义，平行线是永不相交的直线。
Parallel lines, by definition, never join.
根据定义，平行线永远不会相交。
Parallel lines, by definition, never join.
根据定义，平行线永远不会相交。
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