科研之友
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<正>受营养不良的影响,非洲的孩子们正饱受发育迟缓的困扰。1When I first started traveling to Africa, I would often meet children and try to guess their ages. I was shocked to find out how often I guessed wrong. Kids I thought were 7 or 8 years old based on their height were actually 12 or 13 years old.
