To avoid knee pain, you can run on soft surfaces to strengthen your leg muscles.
为避免膝盖疼痛，您可以在柔软的平面上跑步以增强腿部肌肉。
Youth is not age , but one kind of state of mind , youth is not only pink cheek, red lip and soft knee.
青春不是年龄，而是一种心境，青春不只是粉颊，朱唇和酥膝。
Youth is not age , but one kind of state of mind , youth is not only pink cheek, red lip and soft knee.
青春不是年龄，而是一种心境，青春不只是粉颊，朱唇和酥膝。
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