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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。