hydraulic draft gear

例句：

1. 1.The hydraulic draft gear is responsible for the oil extraction process.
   液压抽油机负责石油提取过程。
2. 2.The hydraulic draft gear is an essential component of the oil drilling equipment.
   液压抽油机是石油钻探设备中不可或缺的一部分。
3. 3. The hydraulic draft gear is designed to efficiently pump oil from the reservoir.
   液压抽油机设计用来从储油层高效地抽取油。