fluid oil

• 液态油,润滑油

fluid oil的用法和样例：

例句

1. The engine oil overflowed onto the spark plugs.
   发动机润滑油溢出流到火花塞上。
2. A well-used door needs no oil on its hinges.
   一记扇经常开启的门的绞链不需要润滑油。