external gear-type oil pump

例句：

1. 1. The external gear-type oilpump is essential for maintaining the smooth operationof the engine.
   外部齿轮型油泵对于保持发动机的平稳运行至关重要。
2. 2. The externalgear-type oil pump was designed toimprove fuel efficiency and reduce emissions.
   外部齿轮型油泵的设计旨在提高燃油效率并减少排放。
3. 3. The external gear-type oilpump has been a popular choice among carowners due to its durability and reliability.
   由于其耐用性和可靠性，外部齿轮型油泵已成为汽车所有者的热门选择。