而因它们质量上的微小差别而形成的“拍”引起了那些特征性的干涉效应。

The "beats" are caused by small physical differences in mass that lead to those telltale interference effects.

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比如，当两个相近的音符同时响起时，会有一种让声音在强弱之间振动的干涉效应，使之形成一个“拍”。

For instance, when two very similar musical notes are played together, there's an interference effect that causes the sound to wobble between loud and soft, producing "beats."

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根据腔长的随机变化、介质色散特性和模竞争效应解释了低频拍和连续噪声谱。

Based on the random variation of cavity length, characteristics of the medium index and mode competition effect, low-frequency beat and noise continuums are explained.

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