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Từ điển Oxford Advanced Learner 8th 
	
		  a turn of speed   
  a ˌturn of ˈspeed idiom  a sudden increase in your speed or rate of progress; the ability to suddenly increase your speed   •He put on an impressive turn of speed in the last lap.    •The kangaroo has a fast turn of speed.     Main entry: ↑turnidiom
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