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Term 1: Term 2:

(subclass MechanicalProcess NaturalProcess) engineering.kif 638-638 子類 機械過程 and 自然過程
(subclass Friction MechanicalProcess) engineering.kif 646-646 子類 摩擦 and 機械過程
(subclass MechanicalResonance MechanicalProcess) engineering.kif 655-655 子類 機械共振 and 機械過程


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