十万个为什么·科学阅读30篇（3）
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How Do Bats Find Their Way in the Dark?
蝙蝠如何在黑暗中找到路？
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Bats fly at night and never bump into trees.蝙蝠夜间飞行，从不撞到树上。
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They use sound waves to 'see' their surroundings.它们利用声波‘看清’周围环境。
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This skill is called echolocation.这种能力叫回声定位。
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A bat sends out high-pitched sounds we cannot hear.蝙蝠发出人类听不见的高音调声音。
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The sounds bounce off walls, insects, or branches.这些声音碰到墙壁、昆虫或树枝后会反弹。
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Then the bat listens for the echoes to know where things are.然后蝙蝠通过聆听回声来判断物体的位置。
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Its ears are very large and sensitive.它的耳朵又大又灵敏。
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This helps it hunt and avoid danger in total darkness.这帮助它在完全黑暗中捕食并避开危险。