每个月进行若干次短距离的山坡反复跑训练可以帮助你保持步幅、肌肉力量和踝关节的灵活性。

Short hill repeats a few times a month will help your stride length, muscular strength and ankle flexibility.

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假脚的灵活性是假肢目前最大的进步，然而假腿踝关节仍无法弯曲。

Flexibility in the foot is the biggest recent advance in prostheses, but artificial legs still have no bend in the ankles.

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