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。
She filmed them, so that she could analyse the frequency with which they beat their tails as they swam and measure the amplitude of these powerful tail strokes .
诺尔博士拍下海豚游动的情况以便于她能分析在游动时它们拍打尾部的频率，同时能测出这些强有力的尾部拍击的振幅。
She filmed them, so that she could analyse the frequency with which they beat their tails as they swam and measure the amplitude of these powerful tail strokes .
诺尔博士拍下海豚游动的情况以便于她能分析在游动时它们拍打尾部的频率，同时能测出这些强有力的尾部拍击的振幅。
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