单词：vaccinal areola
[医] 接种红晕
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The warring factions in Afghanistan say they will heed a call by the United Nations to stop fighting so aid workers can begin a three-day polio vaccination campaign. The Taliban, the Afghan army and international military forces say they will halt t
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By David McAlary Washington 23 May 2006 Chickens at US farm Scientists have developed an efficient, cheap way to vaccinate birds against avian influenza and possibly prevent the spread of the deadly H
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健康与经济
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