Mom：

　　Exactly, next, you should hold your legs together and extend your arms above your head. OK, here we go. Then, kick your legs up and down together in a whipping motion generating from the hips and bending at the knees, as if you were a dolphin.

　　对呀，下一步，把你的双脚合拢，把你的胳膊放到你的头上。好，这就对了。通过髋关节和膝关节用力运动，上下踢你的腿，就像海豚一样。

　　Daniel：

　　Yes, like a dolphin. Am I on the right track?

　　嗯，像海豚一样。我做对了吗?

　　Mom：

　　That's the way to go. Now, you are flying, my boy.

　　对了。孩子，你进步了。

　　我最喜欢的运动是游泳

　　Bob：

　　I think there is nothing better than swimming for excercise.

　　我认为什么运动都不如游泳。

　　Kate：

　　Why?

　　为什么?

　　Bob：

　　Because it can boost our whole body capaity.

　　因为它能增强我们全身的机能。

　　Kate：

　　How many strokes are there usually?

　　通常有几种游泳姿势?

　　Bob：

　　There are freestlye, backstroke, butterfly, frog stroke and etc.

　　有自由泳、仰泳、蝶泳、蛙泳等。

　　Kate：

　　I heard exercise can also boost brain function.

　　我听说，运动还能增强大脑功能。

　　Bob：

　　Yes. Exercise can improve blood flow and spur cell growth, and exercise can lose weight.

　　是的，锻炼能促进血液流动和细胞生成，而且运动还能减肥。