蝙蝠用超声波识别猎物发出的震动。

Bats use ultrasound to pick up vibrations from their prey.

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在印度北部旁遮普邦的一家医院，经过一轮超声波扫描鉴定后只有一个被误识别为男孩的女婴降生，本来以为会降生一对男性双胞胎。

In one hospital in Punjab, in northern India, the only girls born after a round of ultrasound scans had been mistakenly identified as boys, or else had a male twin.

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这些无线电系统之间就像光波与声波一样彼此区别，比如，人造卫星就无法追踪射频识别标签。

These radio systems are as different from each other as light is from sound, so satellites cannot track RFID tags, for instance.

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We're used to thinking about sound being tranduced; being converted by acoustic waves into electrical signals that can be recognized by your iPods.

我们想想声音信号的转换过程,声音由声波转化为电子信号,你的iPod能够识别这种信号

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