猜测是城里人过敏比例多于农民,想从前辈的经验中验证一下猜得对错。免疫的交叉反应也是可以考虑的因素之一。
猜测是城里人过敏比例多于农民,想从前辈的经验中验证一下猜得对错。免疫的交叉反应也是可以考虑的因素之一。
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