短語詞組短語toughen up 困難，使強(qiáng)壯toughen mechanism 增韌機(jī)理stump toughen 殘肢韌化toughen ing 熱固性樹脂toughen inspection 經(jīng)久transformation toughen 相變增韌Toughen glass 鋼化玻璃toughen effect 增韌效果 返回 toughen