在高校普通体育课教学中，增加跑的练习是本文所进行实验研究的主要内容。
This paper investigated the effect of added running on strengthening students' physique in the college general physical education.
汤姆不能像他的朋友们那样跑，所以他努力练习跑步。
Tom cannot run as his friends, so he practices running very hard.
为避免膝盖疼痛，你可以在柔软的地面上跑步，多加练习来加强腿部肌肉，尽量不在斜坡上跑，并买双好的跑鞋。
To avoid knee pain, you can run on soft surfaces, do exercises to strengthen your leg muscles, avoid hills and get good running shoes.
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