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BBC
1 年
Sound Waves
trumpet the sound from the trumpet comes from a vibrating column of air created by buzzing lips of the trumpeter A sound wave is a longitudinal wave. When an object vibrates it produces a ...
18 天
英汉双语阅读81:蝙蝠是如何进行回声定位的?
回声定位叫声通常为超声波——频率范围在20赫兹至200千赫兹之间,而人类的正常听力上限通常约为20千赫兹。即便如此,我们仍能听到某些蝙蝠(例如斑点蝠)发出的回声定位声。这些噪音类似于两颗圆形卵石相互撞击所产生的声音。总体而言,回声定位叫声的特征体现于 ...
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