猜測是城裏人過敏比例多於農民,想從前輩的經驗中驗證一下猜得對錯。免疫的交叉反應也是可以考慮的因素之一。
猜測是城裏人過敏比例多於農民,想從前輩的經驗中驗證一下猜得對錯。免疫的交叉反應也是可以考慮的因素之一。
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