这两条铁轨是平行的。

zhè liǎng tiáo tiěguǐ shì píngxíng de.

These two railroad tracks are parallel.

平行线永远不会相交。

píngxíngxiàn yǒngyuǎn bùhuì xiāngjiāo.

Parallel lines will never intersect.

这两个项目在发展方向上是平行的。

zhè liǎng gè xiàngmù zài fāzhǎn fāngxiàng shàng shì píngxíng de.

These two projects are parallel in their development direction.