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Term 1: Term 2:

(subclass PetroleumLubricant RefinedPetroleumProduct) Economy.kif 5935-5935 子類 石油潤滑劑 and 精煉石油產品
(subclass MotorOil PetroleumLubricant) Economy.kif 5939-5939 子類 機油 and 石油潤滑劑


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