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为什么指甲比脚趾甲长得快？

Fingernails grow about twice as fast as toenails—roughly 3.5 mm per month versus 1.6 mm—due to differences in blood flow and usage.
Fingers receive richer circulation and experience more frequent minor trauma, both of which stimulate nail matrix cell division.
The nail matrix—the tissue under the cuticle—is more active in hands, producing keratin faster to repair daily wear.
Toenails grow slower partly because feet are cooler and less active, reducing metabolic signals for rapid growth.
Dominant-hand nails often grow fastest, suggesting mechanical stimulation plays a role beyond genetics alone.
Nail growth also slows with age, illness, or poor nutrition, but the finger-toe speed difference remains consistent.
Unlike hair, nails don’t have muscles or nerves, so their growth depends entirely on matrix health and local environment.
Doctors sometimes check nail growth rates to assess overall health, especially in chronic disease monitoring.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Dominant-hand nails often grow fastest, suggesting mechanical stimulation plays a role beyond genetics alone. 惯用手的指甲往往长得最快，表明机械刺激的作用不单取决于遗传因素。
Doctors sometimes check nail growth rates to assess overall health, especially in chronic disease monitoring. 医生有时通过观察指甲生长速度来评估整体健康状况，尤其用于慢性病监测。
Fingernails grow about twice as fast as toenails—roughly 3.5 mm per month versus 1.6 mm—due to differences in blood flow and usage. 指甲生长速度约为脚趾甲的两倍——每月约3.5毫米，而脚趾甲仅约1.6毫米，这与血流和使用频率的差异有关。

这篇中文题目最接近哪一句？为什么指甲比脚趾甲长得快？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？指甲生长速度约为脚趾甲的两倍——每月约3.5毫米，而脚趾甲仅约1.6毫米，这与血流和使用频率的差异有关。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Do Our Fingernails Grow Faster Than Toenails? How to cook noodles A maths worksheet

Dominant-hand nails often grow fastest, suggesting mechanical stimulation plays a role beyond genetics alone.

Dominant-hand nails often grow fastest, suggesting mechanical stimulation plays a role beyond genetics alone.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Dominant-hand nails often grow fastest, suggesting mechanical stimulation plays a role beyond genetics alone.