反之，如果缺乏这类早期接触，免疫系统就可能出现紊乱，做出过激反应，如对食物、花粉和宠物毛屑过敏等，或者引发人体机理问题，出现自身免疫失调。
Without such early instruction, the immune system may go haywire and overreact with allergies to foods, pollen and pet dander or turn on the body's own tissue, setting off autoimmune disorders.
杏树为蜜蜂提供了丰盛的食物和落脚休息之地，其回报是浑身沾满花粉的蜜蜂与花朵的亲密接触，因而得到与其他杏树异株授粉的机会。
By offering fly-through hospitality, the trees win the prize of a brush with a pollen-covered bee and the chance of cross-pollination with another tree.
变应原的种类很多，包括寄生虫、真菌、药物、花粉、食物等。
Changes should the original type be many, including parasite, fungus, medicine, pollen, food and so on.
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