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。
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。
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。
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