acid wastewater from coal mine的用法和样例：
- Wastewater from coal mine
- Coal mine is the main industry in China, two-thirds of our expending of energy source is from coal.
- Large quantities of acidic wastewater were discharged by some small coal mines in Fengcheng city, which polluted the local farmlands and destructed the ecological environment.
- Customers and coal trading enterprises in coal marketing areas shall have the right to buy coal directly from coal mining enterprises.