【囧研究】长得黑要多喝奶！
<p><span word="Cow">Cow</span>'<span word="s">s</span> <span word="milk">milk</span> <span word="is">is</span> <span word="the">the</span> <span word="primary">primary</span> <span word="source">source</span> <span word="of">of</span> <span word="vitamin">vitamin</span> <span word="D">D</span> <span word="for">for</span> <span word="children">children</span>, <span word="but">but</span> <span word="dairy">dairy</span> <span word="products">products</span> <span word="can">can</span> <span word="interfere">interfere</span> <span word="with">with</span> <span word="the">the</span> <span word="absorption">absorption</span> <span word="of">of</span> <span word="iron">iron</span>. <span word="Pediatricians">Pediatricians</span> <span word="have">have</span> <span word="never">never</span> <span word="known">known</span> <span word="how">how</span> <span word="much">much</span> <span word="milk">milk</span> <span word="a">a</span> <span word="child">child</span> <span word="should">should</span> <span word="drink">drink</span>. <span word="Now">Now</span> <span word="researchers">researchers</span> <span word="have">have</span> <span word="established">established</span> <span word="that">that</span> <span word="for">for</span> <span word="most">most</span> <span word="children">children</span>, <span word="two">two</span> <span word="cups">cups</span> <span word="a">a</span> <span word="day">day</span> <span word="achieves">achieves</span> <span word="the">the</span> <span word="right">right</span> <span word="balance">balance</span>.</p><p>牛奶是儿童获取维生素<span word="D">D</span>的主要来源，但是乳制品会阻碍铁的吸收。一直以来，儿科医师并没有明确了解儿童牛奶的饮用量应为多少。如今，研究人员发现，对于大多数儿童而言，每天两杯牛奶（总计500毫升——编注）便可以达到合理的平衡。</p><p><span word="Canadian">Canadian</span> <span word="scientists">scientists</span> <span word="studied">studied</span> <span word="more">more</span> <span word="than">than</span> 1,300 <span word="healthy">healthy</span> 2- <span word="to">to</span> 5-<span word="year">year</span>-<span word="olds">olds</span>, <span word="collecting">collecting</span> <span word="data">data</span> <span word="on">on</span> <span word="diet">diet</span> <span word="and">and</span> <span word="physical">physical</span> <span word="activity">activity</span>. <span word="They">They</span> <span word="took">took</span> <span word="blood">blood</span> <span word="samples">samples</span> <span word="to">to</span> <span word="measure">measure</span> <span word="iron">iron</span> <span word="and">and</span> <span word="vitamin">vitamin</span> <span word="D">D</span> <span word="levels">levels</span>.</p><p>加拿大科学家调查了1300多名两岁到五岁的健康儿童，收集了他们的饮食和运动数据，并且抽取了儿童血液样本来测量铁和维生素<span word="D">D</span>的含量水平。</p>
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