coal mine

名词 coal mine:

1. a mine where coal is dug from the ground
   同义词：coalpit

1. A four-wheeled, open, box-shaped wagon or iron car run on tracks in a coal mine.
   矿车、煤车煤矿中在轨道上行驶的四轮、开口、盒状的运货车或铁制车厢
2. That coal mine is no longer worked.
   那个煤矿已经不经营了。
3. They are ventilating the sap of a coal mine.
   他们正在使煤矿坑道通风。