coal mine city的用法和样例：
- Over the past only grain, coal mining city of farmers, is now vigorously develop vegetables, fruit and emerging aquaculture industry, and built one ecological park everywhere.
- Born in the coal mining city in Fukuoka, Masaya grows up with inheriting both sides of the genes of his forever hopeless and reckless Dad and the gentle and strong Mom.
- They are ventilating the sap of a coal mine.
- That coal mine is no longer worked.
- There are different redundance rate between prefecture coal mining cities and county coal mining cities.
- We decided to open out a coal mine near the city.