Another inappropriate response of the immune system is allergy.

另一种免疫系统的不恰当反应是过敏。

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The manifestations of allergy—sneezing, wheezing, itching, and rashes—are signs of an immune system running amok, attacking foreign invaders that normally mean no harm.

过敏的临床表现包括喷嚏、气喘、瘙痒和红疹等，这些都是免疫系统紊乱而对通常无害的外来物质发起攻击的表现。

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With a cow's-milk allergy, the immune system has an abnormal reaction to milk protein.

而对牛奶过敏是指免疫系统对牛奶蛋白质有异常反应。

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I've now been told I have no allergy but chronic ordinary urticaria which basically means my immune system is rubbish and anything could trigger a reaction of various degrees at anytime.

BBC: Children with allergies 'being let down': Your comments