夏天到了，又到了游泳的季节！那么，你知道海里游得最快的动物是谁吗？卖个关子，好奇的你看看下面的文章吧！  The ocean has many good swimmers.Sailfish (旗鱼) are some of the fastest swimmers.A sailfish can swim up to110 kilometers per hour!  大海里游得最快的动物是谁？旗鱼就是其中之一！它的最高速度可达110公里/时！  Why can sailfish  swim so fast?  Large gill鱼鳃  I get more oxygen (氧气)from the water.  旗鱼的鱼鳃可以帮它从水里获得更多氧气。  Powerful tail强壮的尾鳍  I move my tail quickly.I have the power to swim fast.  强有力的尾鳍可以帮它快速摆尾，游得更快。  Sharp ‘mouth’尖尖的嘴  My bill (吻突) is long and thin.I use it to“cut” the water in front of me.It is like I am building an underwater road!  又长又尖的吻突可以帮它减少阻力——就像给自己在水下开了条路一样！  Who is faster?  Sailfish need less than 10 seconds to finish a 200-meter race.Olympic record-holder (奥林匹克纪录保持者) Michael Phelps needs almosttwo minutes!  游完200米，旗鱼只需要不到10秒的时间！奥林匹克纪录保持者Michael Phelps需要两分钟才能完成！  旗鱼游的也太快了吧！