万万没想到：让人年轻2岁的秘诀竟然是它！
<p><span word="Scientists">Scientists</span> <span word="say">say</span> <span word="they">they</span> <span word="have">have</span> <span word="made">made</span> <span word="a">a</span> <span word="leap">leap</span> <span word="in">in</span> <span word="knowing">knowing</span> <span word="why">why</span> <span word="some">some</span> <span word="people">people</span> <span word="retain">retain</span> <span word="their">their</span> <span word="youthful">youthful</span> <span word="looks">looks</span> <span word="while">while</span> <span word="others">others</span> <span word="age">age</span> <span word="badly">badly</span>.</p><p>科学家称他们已经在探究为什么有的人青春长驻而另一些人逐年老去这一问题上取得突破性进展。</p><p><span word="They">They</span> <span word="found">found</span> <span word="the">the</span> <span word="first">first</span> <span word="part">part</span> <span word="of">of</span> <span word="human">human</span> <span word="DNA">DNA</span> - <span word="the">the</span> <span word="genetic">genetic</span> <span word="code">code</span> - <span word="that">that</span> <span word="seems">seems</span> <span word="to">to</span> <span word="affect">affect</span> <span word="how">how</span> <span word="old">old</span> <span word="people">people</span> <span word="look">look</span> <span word="to">to</span> <span word="others">others</span>. <span word="The">The</span> <span word="mutations">mutations</span>, <span word="reported">reported</span> <span word="in">in</span> <span word="the">the</span> <span word="journal">journal</span> <span word="Current">Current</span> <span word="Biology">Biology</span>, <span word="were">were</span> <span word="in">in</span> <span word="the">the</span> <span word="genetic">genetic</span> <span word="instructions">instructions</span> <span word="for">for</span> <span word="protecting">protecting</span> <span word="the">the</span> <span word="body">body</span> <span word="from">from</span> <span word="UV">UV</span> <span word="radiation">radiation</span>. <span word="But">But</span> <span word="these">these</span> <span word="can">can</span> <span word="also">also</span> <span word="lead">lead</span> <span word="to">to</span> <span word="red">red</span> <span word="hair">hair</span>, <span word="and">and</span> <span word="experts">experts</span> <span word="caution">caution</span> <span word="the">the</span> <span word="findings">findings</span> <span word="may">may</span> <span word="be">be</span> <span word="confused">confused</span> <span word="by">by</span> <span word="eye">eye</span>, <span word="skin">skin</span> <span word="or">or</span> <span word="hair">hair</span> <span word="colour">colour</span>.</p><p>他们发现人类<span word="DNA">DNA</span>——基因密码——的第一部分似乎会影响一个人在别人眼里看起来有多老。据《当代生物学》杂志报道，遗传指令会发生变化，保护身体免受紫外线辐射的伤害。但这些变化同时会导致头发变红，而且专家警告说研究结果会受到瞳色、肤色或发色的影响。</p>
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