dài xiè 
		replacement
substitution
metabolism (biol.)
		 
		
		
		
		
			 
		
				
		
			xīn chén dài xiè 
		metabolism (biology)
the new replaces the old (idiom)
		 
		
		
		
		
			 
		
				
		
			fēn jiě dài xiè 
		catabolism (biology)
metabolic breaking down and waste disposal
dissimilation
		 
		
		
		
		
			 
		
				
		
			hé chéng dài xiè 
		anabolism (biology)
constructive metabolism (using energy to make proteins etc)
assimilation