黑蚱蝉室内的惊鸣声和自鸣声，虽然音色有一定的变化，但仍保持自然鸣声的结构层次。
The protest songs and the free songs in the room still retain the structural level of the natural songs though the timbres present some changes.
在时变功率谱分析中发现，蚱蝉功率谱的某些成分有显著的变化，可作为蝉类间信息传递的一种方式。
Analysis of power spectrum for cicada's song, and it is a possible way for cicadas transfering their information.
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