结果表明，非线性主要来源于热起伏磁后效和为了降低微涡流损耗而引起的磁畴数随频率的变化。

The results show that the non-linearity is mainly attributed to a thermal fluctuation magnetic after effect and a numerical variation of the magnetic domain with frequency.

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高频的频率边带由于幅度交叠的部分较少，所以对强度起伏贡献较少。

The higher frequency sidebands would have less contribution to the fluctuation due to smaller amplitude overlapping.

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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；

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.

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