yíng rèn ér jiě 
		lit. (bamboo) splits when it meets the knife's edge (idiom)
fig. easily solved
		 
		
		
														
		
		
			 
		
				
		
			dāo rèn 
		knife blade
crucial point
		 
		
		
		
		
			 
		
				
		
			yóu rèn yǒu yú 
		handling a butcher's cleaver with ease (idiom); to do sth skillfully and easily
		 
		
		
		
		
					
				
		
			bīng bù xuè rèn 
		lit. no blood on the men's swords (idiom); fig. an effortless victory
		 
		
		
														
		
		
			 
		
				
		
			shuāng rèn jiàn 
		double-edged sword (both lit. and fig.)