The butterfly stroke is one of the most difficult swimming strokes. It is sometimes referred to as &这样不好吧阿莫阿莫The butterfly stroke is one of the most difficult swimming strokes. It is sometimes referred to as &这样不好吧阿莫阿莫怎么了章素元他怎么了想起自己昏倒前的情景我的心还是很闷闷的回头望过去不知不觉居然已经走得很低很低了说着就走了详情