qiān lǐ zhī dī , kuì yú yǐ xué 
		An ant hole causing the collapse of a great dike.
Huge damage from a moment's negligence. (idiom)
		 
		
		
														
		
		
			 
		
				
		
			qiān lǐ zhī dī , kuì yú yǐ xué 
		An ant hole causing the collapse of a great dike.
Huge damage from a moment's negligence. (idiom)