十万个为什么·科学启蒙30篇（3）
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My Nails Keep Growing Every Week
我的指甲每周都在长
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Your nails grow slowly from the base near your cuticles.指甲从靠近甲根的基部缓慢生长。
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New cells push older ones forward as they multiply under the skin.新生细胞在皮肤下增殖，将老细胞向前推。
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Fingernails grow faster than toenails because fingers get more blood flow.手指甲比脚趾甲长得快，因为手指血液供应更丰富。
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Nail growth speeds up slightly when you're younger or during warm weather.年轻时或天气温暖时，指甲生长速度会略微加快。
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Biting your nails doesn’t stop them from growing — it just makes them shorter.咬指甲并不能阻止其生长，只会让指甲变短。
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Healthy eating helps keep nails strong, but won’t change their growth rate.健康饮食有助于保持指甲强韧，但不会改变其生长速度。
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You can trim fingernails every 7–10 days to keep them neat and clean.可每7–10天修剪一次手指甲，以保持整洁干净。
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Doctors check nail color and texture to learn about your general health.医生通过观察指甲颜色和质地来评估整体健康状况。
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Nails don’t feel pain because they have no nerves inside the hard part.指甲本身没有痛觉，因其坚硬部分不含神经。
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Even when you sleep, your nails are quietly adding tiny new layers.即使在睡眠中，指甲也在悄然增添微薄新层。