He says it is possible to detect different species of mosquito because their wings beat with a distinctive frequency.

他表示，检测不同种的蚊子是有可能的，因为它们翅膀扇动的频率有着明显区别。

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The influence of time length and beat frequency on radar range is discussed.

讨论了信号时长和差拍频率对雷达作用距离的影响；

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The envelope of the beat frequency is depicted as the grey areas.

信封的摆动频率是描述的灰色地带。

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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