道理

今天回家后继续跑步活动。在这大约1.5英里的过程中,我在气喘吁吁之余,似乎体会了三个道理。
1. 下坡容易上坡难。
2. 竞技与否,极大决定体育运动者的心情。
3. 体重越重,在摩擦系数恒定的不光滑平面上保持匀速直线运动所需的动力也就越大。

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