The butterfly was " born " in the early 1950 ' s as a loophole in the breaststroke rules and in 1956 became an olympic event in melbourne , australia 早在1950年蝶泳就作为一种枪眼（望孔）诞生在蛙泳规则之中，接着在1956年澳大利亚的摩尔本成为一项奥林匹克比赛。
Her enthusiasm , hard work and dedication won her bronze medals in the women ' s 50 - metre breaststroke at the 4th east asian games and the 7th asian swimming championships 凭著信心和坚持，孙同学早前在第四届东亚运动会和第七届亚洲游泳锦标赛的女子组五十米蛙泳项目中均取得铜牌。
This is going back to kicking breaststroke on his back and the pullbuoy acctually makes you concentrate harder on your line position , puts an artificial float instead of presses his back position even more 这里又回到了仰面蛙泳踢腿练习，夹板的作用是让你关注身体姿态，在仰卧时人为施加了浮力，而不是压力。
Through literature study , expert interview and case analysis , the paper discusses the influences of the amendment to the 2005 international swimming rules on the international breaststroke achievements and analyzes the general situation and the development trend of the breaststroke in order to provide theoretical basis for the achievements of breaststroke in the beijing olympic games 摘要运用文献资料法、专家访谈法、个案分析法等方法，分析、探讨2005年游泳规则修改后对世界泳坛蛙泳成绩的影响，了解世界蛙泳的基本动态、技术的发展方向等，为我国在北京奥运会上摘金夺银提供一定的理论基础。
