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How Do Bats Find Their Way in the Dark?
蝙蝠怎么在黑暗中找到路？
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Bats cannot see well in total darkness.蝙蝠在完全黑暗中视力很差。
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They use sound waves to 'see' their surroundings.它们利用声波‘观察’周围环境。
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They send out high-pitched calls no human can hear.它们发出人类听不见的高音叫声。
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These sounds bounce off walls, trees, and insects.这些声音会从墙壁、树木和昆虫身上反射回来。
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Bats listen carefully to the returning echoes.蝙蝠仔细聆听返回的回声。
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Their ears and brains measure tiny time differences.它们的耳朵和大脑能精确测量极微小的时间差。
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This tells them size, shape, and distance of objects.从而判断物体的大小、形状和距离。
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This system is called echolocation — like nature's sonar.这一系统称为回声定位——即大自然的声呐。