28/9 (12) 三種游泳方式的英文名稱

1. 自由式 Freestyle
2. 蛙式 Breast Stroke
3. 背泳 Backstroke / Back Crawl

自由式 - Front crawl
also known as The Australian Crawl, is usually regarded as the fastest swimming style developed. It is one of two long axis strokes, the other being the backstroke. Unlike the backstroke, butterfly, and breaststroke, the front crawl is not regulated by FINA, but it is nearly universally swum in freestyle competitions

蛙式 - Breaststroke
is a swimming style swum on the breast. It is the most popular recreational style due to its stability and the ability to keep the head out of the water at all times. In most swimming classes, beginners learn either the breaststroke or the front crawl first. In competitive swimming however it is regarded as one of the most difficult strokes requiring comparable endurance to other strokes.

背泳 - back crawl / blackstroke
also sometimes called back crawl is one of the three swimming styles regulated by FINA, and the only regulated style swum on the back. This has the advantage of easy breathing, but the disadvantage of not seeing where the swimmer is heading to. It is also the only competition swimming style that starts in the water. The swimming style is similar to an upside down front crawl. Both backstroke and front crawl are long-axis strokes.

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蝶式 - Butterfly stroke
(fly for short) is a swimming stroke swum on the breast, with both arms moving simultaneously. The butterfly kick was developed separately, and is also known as the "dolphin kick". While other styles like the breaststroke, front crawl, or backstroke can be swum easily even by beginners, the butterfly requires very good technique to be feasible. Many students consider it the most difficult style. It is the newest swimming style swum in competition, first swum around 1934.

References:
http://en.wikipedia.org/wiki/Front_crawl
http://en.wikipedia.org/wiki/Breaststroke
http://en.wikipedia.org/wiki/Backstroke
http://en.wikipedia.org/wiki/Butterfly_stroke