声强起伏，声强在短时间内的迅速无规变化注 sound intensity fluctuation 在短短的大约5年时间内那个人就由贫致富 the man went from rags to riches in a short period of about five years ..
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For a fixed sound source depth, the acoustical fields caused by high send frequency has strong sound intensity fluctuation, and their variation is sharp enough in an adjacent range.
对固定的声源深度，发射频率大的声场对应的声强起伏大，且相邻距离处起伏的强度很剧烈；
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