短语词组短語roof weakening 頂板弱化Weakening Venom 衰弱毒素strain weakening 變弱化Phonetic Weakening 語音弱化Weakening slope 弱化值;和弱化值weakening coefficients 弱化系數And Weakening 戰和弱化weakening operator 弱化算子weakening ability 能力減弱 返回 weakening