Unlike an ocean wave, a wavefront or surface of constant phase is unobservable and undetectable.

和海浪不同，波阵面或固定相平面是不能观测和不能发现的。

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Unlike an ocean wave, a wavefront or surface of constant phase is unobservable and undetectable.

和海浪不同，波阵面或固定相平面是不能观测和不能发现的。

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