external gear oil pump

例句：

1. 1. The external gearoil pump is essential for the smooth operation of the machine.
   外部齿轮油泵对于机器的顺畅运行至关重要。
2. 2. The external gear oil pump was designed to improve the efficiency of the machinery.
   外部齿轮油泵被设计用来提高机械的效率。
3. 3. The external gear oil pump was replaced after it failed during a critical maintenance period.
   在关键的维护期，外部齿轮油泵出现了故障，因此被更换。