单词：morbus serumalis
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Helper Serum Boosts Effectiveness of Flu Vaccine Vaccines against swine and avian flu can be made more effective by the addition of a helper serum known as an adjuvant. The finding from a new study could let vaccine makers stretch supplies and possib
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This is the VOA Special English Agriculture Report. A burro is a small donkey. Another way that people say it is BOOR-oh. The name comes from Spanish and, before that, from a Latin term for a small horse. Donkeys are related to horses. Both are part
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What are buskers? They are street performers. They perform circus acts like acrobatics or juggling, or singing and dancing, and they are always very clever and very funny. They get paid at the end of their show when the audience throws money in the h
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