An exercise involving a portion or part of a stroke, used to improve technique. 用于改进技术所做的包括某泳姿的一段或一部分的练习。
At a Chinese-financed ballbearing factory in East London, technicians form Taiwan show local female workers improved techniques. 在东伦敦由华人投资的球鞋厂里，从台湾来的技师正在指导当地女工改进技术。
