所以通过对冲击噪声频谱的研究，分析产生冲击噪声的瞬时时间与频谱之间的关系是十分必要的。
It is significant to study the spectrum of impact noise and the relation between spectrum of impact noise and transient time length.
所以通过对冲击噪声频谱的研究，分析产生冲击噪声的瞬时时间与频谱之间的关系是十分必要的。
It is significant to study the spectrum of impact noise and the relation between spectrum of impact noise and transient time length.
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