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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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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