911chaxun查询·英语单词大全
1. It puts forward that inverted breaststroke and inverted crawl in synchronization may help beginners to master the way of change breath very conveniently. 本文通过对比实验，指出掌握水中换气方法是学习蛙泳技术及其他泳姿动作的关键，提出同步的反蛙泳和仰泳练习，可以使初学者快捷地学会蛙泳的换气动作。