4 sentences

1. 他从事环卫工作多年。

   tā cóng​shì huán​wèi gōng​zuò duō nián.

   He has worked in environmental sanitation for many years.

   Source: Dong Chinese Dictionary

2. 环卫工人正在清理低洼处的积水。

   huán​wèi gōng​rén zhèng​zài qīng​lǐ dī​wā​chù de jī​shuǐ.

   Sanitation workers are clearing the standing water in low-lying areas.

   Source: Dong Chinese Dictionary

3. 环卫工人们正忙着铲路上的积雪。

   huán​wèi gōng​rén men zhèng máng zhe chǎn lù​shang de jī​xuě.

   Sanitation workers are busy shoveling snow from the road.

   Source: Dong Chinese Dictionary

4. 环卫工人每天清晨就开始清理街道。

   huán​wèi gōng​rén měi tiān qīng​chén jiù kāi​shǐ qīng​lǐ jiē​dào.

   Sanitation workers start cleaning the streets early every morning.

   Source: Dong Chinese Dictionary