Peaking in the frequency spectrum due to repetition of signals by multiple reflection is not confined to water layers. 多次反射波引起的信号重复在频谱中造成的峰值增多，并不仅仅局限于水层。
A particularly troublesome type of multiple produces the coherent noise known as singing. 一种特别伤脑筋的多次反射引起同相干扰，这种干扰称为鸣震。
