单词：fluid oil
fluid oil的用法和样例：
例句
- The engine oil overflowed onto the spark plugs.发动机润滑油溢出流到火花塞上。
- 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。
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flow vi.流，流动 flower n.花，花卉；开花 flu n.流行性感冒 fluctuate vi.波动 vt.使波动 fluent a.流利的，流畅的 fluid n.流体，液体 flush n.兴奋，脸红；发烧 flute
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