挖沟

gōng rén zài lù páng wā gōu

工人在路旁挖沟。

Workmen were digging a trench beside the road.

tā men shì zài dōng tiān wā gōu pū shè yóu guǎn de

他们是在冬天挖沟铺设油管的。

It was in winter that they dug trenches and laid the oil pipes.