hydraulic coal mining technology

例句：

1. 1. The hydraulic system in the factory is very efficient.
   工厂里的液压系统非常高效。
2. 2. Thehydraulic pump is responsible for supplying water to the sprinkler system.
   液压泵负责向喷头系统供水。
3. 3. Hydraulic systems are commonly used inconstruction machinery and vehicles.
   液压系统常用于建筑机械和车辆中。