small piece of coal

例句：

1. 1. The fire needs a small piece of coal to start.
   火需要一小块煤才能点燃。
2. 2. He found a small piece of coal in the corner of the room.
   他在房间的角落里发现了一小块煤。
3. 3.The old man used to light his stove with a small piece of coal.
   这位老人过去常用一小块煤来点他的炉子。