zuàn xīn 
		to sneak in
to infiltrate
to be piercingly painful
to be unbearable (of pain, itch etc)
		 
		
		
														
		
		
			 
		
				
		
			zuān xīn chóng 
		boring insect
snout moth's larva (Aphomia gullaris or Plodia interpuncuella or Heliothus armigera etc), major agricultural pest
		 
		
		
														
		
		
			 
		
				
		
			zuān xīn 
		to sneak in
to infiltrate
to be piercingly painful
to be unbearable (of pain, itch etc)