While other styles like the breaststroke, front crawl, or backstroke can be swum easily even by beginners, the butterfly is a more difficult stroke that requires good technique to be feasible.

初学者也许能很容易地掌握蛙泳、自由泳或仰泳，但蝶泳却难得多，对游泳者的技术要求很高。

youdao

You guessed it. One minute our diver was making like Flipper in the Pacific, the next he was doing a breaststroke in a fire bucket 300 feet in the air.

你猜对了，前一分钟我们的潜水员还在太平洋里用脚蹼游水，下一分钟他就在300英尺高空的一个救火水桶里做蛙泳了。

youdao

Bobo: China got more chances. Among freestyle, breaststroke, backstroke, butterfly, which style do you like best, Andy?

波波：中国有机会的。安迪，在自由泳，蛙泳，仰泳，蝶泳四种泳姿里，你最喜欢哪种泳姿啊？

youdao

He hauled it in, slid himself back via something like a reverse breaststroke, got to his knees, stood, retreated a few steps, and was once again fifteen feet away and safe.

NEWYORKER: Tenth of December