名词中文翻译
中文翻译：自由油
同义词：
['unleaded oil', 'unrefined oil']
例句：
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1. The free oil in the engine is causing a problem.
发动机中的自由油正在造成问题。
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2. Free oil can be dangerous if it's not properly drained.
如果不妥善排放，自由油可能是危险的。
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3. The car was given a new oil change to fix the free oil issue.
为了解决自由油的问题，这辆车被送去换了新的机油。