相平行的线不管延伸多长，永远都不会相交。

Parallel lines will never meet no matter how far extended.

《柯林斯英汉双解大词典》

铸币通常是做表面平行的线，与小金属流动是参与行动的。

Coining is usually done on surfaces parallel to the parting line, and little metal flow is involved in the operation.

youdao

假定一个常规的击球初始姿势，如果可能的话在面前画一条可见的与双脚平行的线。

Assume your normal golf stance facing a visible line parallel to your feet, if possible.

youdao