十万个为什么·科学阅读30篇（5）
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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 third month of pregnancy.指纹在出生前、怀孕第三个月就已形成。
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Skin grows at different speeds on fingertips, making ridges.指尖皮肤以不同速度生长，从而形成纹路。
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No two people — not even twins — have the same pattern.没有任何两个人——包括双胞胎——的指纹图案完全相同。
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Ridges help us hold things better and feel fine textures.纹路有助于我们更牢固地抓握物体，并感知细微纹理。
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They also help move water away when fingers are wet.它们还能在手指湿润时将水分导走。
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Police use fingerprints to identify people safely and clearly.警方利用指纹安全、清晰地识别人员。
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Each fingerprint has loops, whorls, or arches as main shapes.每枚指纹的主要形状为环形、螺形或弓形。
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They stay the same from babyhood until death.指纹从婴儿期到去世都保持不变。