parallel lines

• 平行直线

parallel lines的用法和样例：

例句

1. A compound pen draws a compound line made up of parallel lines and spaces.
   复合钢笔绘制由平行直线和空白区域组成的复合直线。
2. Parallel lines converge at infinity.
   平行线永不相交。
3. He proved the existence of parallel lines.
   他证明了平行线的存在性。