coal-water pump

例句：

1. 1.The coal-water pump is used to extract coal from the underground mines.
   煤水泵用于从地下矿井提取煤炭。
2. 2.The coal-water pump is essential for maintaining the safety of the mining operation.
   煤水泵对于维护采矿作业的安全至关重要。
3. 3. The coal-water pump was designed to improve efficiency and reduce energy consumption.
   煤水泵被设计来提高效率并减少能源消耗。