the bats can also 「sweep through a frequency range of up to 170 kilohertz, 」 moving from lower to higher notes, 「while a human singer produces a glissando through less than 2 kilohertz at most.」
蝙蝠音频频率范围也可以高达170千赫,是=由从低频逐渐到高频。
while performing the seismic modelling experiment, it needs to have tens to hundreds of kilohertz and well-distributed orientation-dependent narrow pulse acoustic wave as simulation source.
在地震模型实验中,需要获得几十至几百千赫的、方向性较均匀的窄脉沖声波作为模拟震源。
its bandwidth of 428 kilohertz means a single segment can carry a bare-bones video picture, compact disc-quality audio, and text for news flashes, weather details and emergency announcements.