a coal cellar的用法和样例：
- My parents were thrown in a coal cellar and next day they started to interrogate my father.
- They are ventilating the sap of a coal mine.
- A coal fell from the fire and burned the mat.
- A coal miner's work is not a bed of roses.
- A coal miner's job is dirty and dangerous at best.
- There is a coal mine near my home town.