A prone floating position in swimming in which the swimmer's arms are extended straight forward above the head and the legs are held together.

一种俯卧状漂浮游泳的姿势，游泳者的胳膊向前直伸超过头部，而且腿合在一起。

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Swimming, cycling, elliptical training, and rowing will burn a lot of calories and improve your aerobic fitness, but be careful not to aggravate injury-prone areas (see below).

游泳，骑车，踩踏机，和划船可以消耗大量卡路里并提高你的有氧功能，但是主要不要过度使用容易受伤的区域（见下）。

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The electrical safety code about hazardous special locations as bathrooms, swimming pools, prinking pools etc, which are all accident-prone, is not perfect.

在安全性能方面，对像浴室、游泳池、喷泉等发生电气事故的危险性较大的特殊场所，我国制定的电气安全法规尚有不完善之处。

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