separation coal

例句：

1. 1. The coal mine is located in the remote mountainous area.
   煤矿位于偏远的山区。
2. 2. The separation of the two streams was due to a sudden rise in water level.
   两条溪流的分离是由于水位突然上升造成的。
3. 3. The coal industry has been undergoing significant changes in recent years.
   近年来，煤炭行业经历了重大变革。