形容词
中文翻译：Unknown
同义词：
['unlubricated', 'ungreased', 'unoiled例句：1. The engine was unlubricated and had to be rebuilt.（发动机未经润滑，需要重新制造。）']
例句：
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1. The engine was unlubricated and had to be rebuilt.
发动机未经润滑，需要重新制造。
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2.The tools were unlubricated and required extra care when used.
工具未经润滑，使用时应多加小心。
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3.The car's brakes were unlubricated, which made stopping difficult.
汽车的刹车未经润滑，刹车困难。