十万个为什么·科学阅读30篇(3)
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Why Do We Have Fingerprints?
人为什么有指纹?
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Fingerprints form before birth in the womb.指纹在胎儿期就在子宫内形成。
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They are patterns of ridges and valleys on skin.它们是皮肤表面的脊线与沟壑构成的图案。
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No two people have the same fingerprints — not even twins.世上没有两个人的指纹完全相同——连双胞胎也不例外。
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Ridges help us hold things better.脊线能帮我们更牢固地抓握物体。
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They give more grip on smooth or wet surfaces.它们能增强在光滑或潮湿表面上的抓握力。
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They also help us feel tiny textures and shapes.它们还能帮我们感知细微的纹理和形状。
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Police use fingerprints to identify people safely.警方利用指纹安全地识别人员。
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Each finger has a unique pattern that never changes.每根手指的纹路图案都独一无二,且终生不变。