An exercise involving a portion or part of a stroke, used to improve technique. 用於改進技術所做的包括某泳姿的一段或一部分的練習。
At a Chinese-financed ballbearing factory in East London, technicians form Taiwan show local female workers improved techniques. 在東倫敦由華人投資的球鞋廠里,從台灣來的技師正在指導當地女工改進技術。