When sound waves enter the cochlea, which is really a tube coiled around, they set a membrane into a back and forth motion and cause a new wave.

当声波进入耳蜗这条盘旋的管道，它令薄膜前后移动并且产生新的波动。

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Less dramatic slowing of the wave causes the surf to spill back down the face of the wave instead of forming a tube.

ECONOMIST: On the beach