... 拍beat 拍频frequency of beat 谱Spectrum ...
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frequency of beat
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以上为机器翻译结果，长、整句建议使用 人工翻译 。
The story about the frequency of the dragonfly's wing beat is not the only rationale that is put forward for the technology.
BBC: Ultrasound mosquito repellents: Zapping the myth
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