petrol cock

例句：

1. 1. The petrol cock is the only way to start the car.
   汽油泵是启动汽车的唯一方式。
2. 2.The mechanic fixed the petrol cock and replaced the old one with a new one.
   机械师修理了汽油泵，并用一个新的替换了旧的。
3. 3. The petrol cock was leaking, so we had to replace it.
   汽油泵漏油了，所以我们不得不更换它。