注册应用程序后，运动日志会问你为什么要锻炼。
After you sign up in the app, RunKeeer will ask you why you are exercising.
但我认为这还是一个很有意思的例子，解释为什么我们要掌握向量的方法去分析运动。
But, still I think it's a very interesting example of why you might want to use vector methods to analyze motions.
他说，重要的是要弄明白这些人为什么以及什么时候感染艾滋病的，这样公共卫生宣传运动才能更有的放矢，以达到预防感染的目的。
He says it is important to understand why and when these people are becoming infected. That way public health campaigns can be better targeted to prevent such infections.
跑步是缓解我们精神压力的极好方法，但是我们需要以非常放松的状态投入这项运动…这就是为什么我们要讨论呼吸。
Running can be a great way to reduce our overall mental stress, but we need to approach the exercise is a relaxed state... and that's where the breathing comes in.
这就是为什么我们要鼓励孩子在一天里多喝水，再有就是在运动会前，中，后都要让孩子补充充足的水分。
This is why we encourage children to drink water all day long at school, and again remind you to ensure your child drinks plenty of water before, during - we will help here - and after Sports day!
在好奇心的驱使下，他走了过去，询问这名运动员为什么要这么吃力地跑到终点。
Out of curiosity, he went over to ask why the athlete wanted to run to the goal with such a difficulty.
在好奇心的驱使下，他走了过去，询问这名运动员为什么要这么吃力地跑到终点。
Out of curiosity, he went over to ask why the athlete wanted to run to the goal with such a difficulty.
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