被纸割伤为什么那么疼？真是十指连心？
<p><span word="Paper">Paper</span> <span word="seems">seems</span> <span word="completely">completely</span> <span word="harmless">harmless</span>, <span word="but">but</span> <span word="deployed">deployed</span> <span word="properly">properly</span>, <span word="it">it</span> <span word="can">can</span> <span word="be">be</span> <span word="a">a</span> <span word="serious">serious</span> <span word="weapon">weapon</span>: <span word="paper">paper</span> <span word="cuts">cuts</span> <span word="are">are</span> <span word="just">just</span> <span word="the">the</span> <span word="worst">worst</span>.</p><p>纸看起来无害，但合理使用的话，它也能成为犀利的武器：最严重的状况就是被纸割伤。</p><p><span word="It">It</span>’<span word="s">s</span> <span word="all">all</span> <span word="to">to</span> <span word="do">do</span> <span word="with">with</span> <span word="nerve">nerve</span> <span word="endings">endings</span>. <span word="To">To</span> <span word="start">start</span> <span word="with">with</span>, <span word="there">there</span> <span word="are">are</span> <span word="lots">lots</span> <span word="more">more</span> <span word="pain">pain</span> <span word="receptors">receptors</span> <span word="embedded">embedded</span> <span word="in">in</span> <span word="your">your</span> <span word="fingertips">fingertips</span> <span word="than">than</span> <span word="almost">almost</span> <span word="anywhere">anywhere</span> <span word="else">else</span> <span word="in">in</span> <span word="your">your</span> <span word="body">body</span>. <span word="So">So</span> <span word="while">while</span> <span word="a">a</span> <span word="paper">paper</span> <span word="cut">cut</span> <span word="on">on</span> <span word="your">your</span> <span word="arm">arm</span>, <span word="or">or</span> <span word="thigh">thigh</span>, <span word="or">or</span> <span word="ankle">ankle</span> <span word="might">might</span> <span word="still">still</span> <span word="be">be</span> <span word="annoying">annoying</span>, <span word="it">it</span> <span word="would">would</span> <span word="probably">probably</span> <span word="be">be</span> <span word="more">more</span> <span word="trivial">trivial</span> <span word="than">than</span> <span word="the">the</span> <span word="intense">intense</span> <span word="fiery">fiery</span> <span word="quality">quality</span> <span word="that">that</span> <span word="finger">finger</span>-<span word="based">based</span> <span word="paper">paper</span> <span word="cuts">cuts</span> <span word="tend">tend</span> <span word="to">to</span> <span word="have">have</span>.</p><p>这跟神经末梢有关。首先，指尖的痛觉感受器比其他任何身体部位要多得多。所以，虽然纸割伤胳膊、大腿、脚踝也很疼，但也要比割伤手指那种火辣辣的疼痛感要轻得多。</p>
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