有些种类的蝙蝠会根据回声频率的变化来调整向猎物移动的方向和速度。

Responding to changes in the CF echo's frequency, bats of some species correct in flight for the direction and velocity of their moving prey.

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他分析了鸣叫声的特征，包括每支“曲子”的发音次数——或者说音节、音节的长度以及鸣声频率。

He analysed the songs' traits, including the number of single sounds - or syllables - per song, the length of the syllables and the song's frequency.

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该设备还能收听跨越17个八度音阶的声频，其音调范围远高于蚊子的蜂鸣，而远低于低沉的雾角。

It can also hear sound frequencies across a span of 17 octaves, spanning pitches far higher than the whine of a mosquito and far lower than a rumbling foghorn.

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