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Section45 nbsp;Swimming etc. The crawl, the backstroke, the breathstoke and the butterfly, what are these?蛙泳、仰泳、自由泳、蝶泳，这些是什么? They are the different strokes we can use when swimming.它们是游泳时我们可以选择的不同划水方式。 There are others, but these are the main ones.还有其它的，但这些是主要的。 These are strokes used for swimming on the water.这些是在水面上游泳的划水方式。 But what about under the water?那水下的呢? Snorkeling is a method of swimming on the surface while looking under the sea.潜游是一种在水上游动并往水下看的游泳方式。 We use a tube which fix into our mouth for breathing, and a mask to help us see.我们用一根管子插入嘴里帮助呼吸，用面罩帮助视觉。 This way we can skim along the surface without bringing our head out of the water for air.这样我们可以沿水面游动而不用抬头呼吸。 We use scuba equipment if we want to go deeper and stay under the water for a longer time.如果要在水里呆得更深一点更久一点，我们可以用水下自我呼吸的配套设备。 Scuba is an acronym for Self Contained Underwater Breathing Apparatus.它是一种为人们在水下自我呼吸的配套设备的首字母缩写。 | 
