Unlike traditional athletic shoes that are built to be stable, rocker-sole shoes are deliberately unstable.
传统的运动鞋是要让人站立平稳，而这种圆弧底鞋子则是刻意要让人站立不稳。
The middle layer of a sole, as of an athletic shoe, often designed to disperse weight or provide stability to the foot.
鞋底的中层，例如运动鞋，常设计用以分散重量或提供足部稳定性。
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