allergen 

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单词释义
n.过敏原,变应原(能引起变态反应或过敏的物质)
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原形:allergen复数:allergens
单词例句
Among them, milk is the most common food allergen for babies under the age of 3, with a prevalence of 2.5 percent to 7 percent, causing symptoms including vomiting, diarrhea and eczema.
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