coal pebble

例句：

1. 1. The coal mine is located in the mountainous region.
   煤矿位于山区。
2. 2.The coal mine has been closed for safety reasons.
   由于安全原因，煤矿已经关闭。
3. 3.The coal mine is a source of employment and economic development in the area.
   煤矿是该地区就业和经济发展的源泉。