短语词组短语decolour bacterium 脱色菌decolour capability 脱色力decolour treatment 脱色率decolour spectrophotometry 退色光度法decolour rate 脱色率decolour degradation 脱色降解decolour r 脱色decolour reaction 褪色反应cervical margin decolour 颈缘变色 返回 decolour