以下为句子列表:
英文: The very concept of a sound wave is valid only when the wavelength is much longer than the distance between molecules of the fluid; on smaller scales, acoustic waves cease to exist.
中文: 我们对声波的观念,只适用于波长比流体分子间距大得多的时候;在更小的尺度下,声波就不存在了。
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