N-VAR
过敏反应；过敏症
If you have a particular allergy, you become ill or get a rash when you eat, smell, or touch something that does not normally make people ill.
例句
Food allergies can result in an enormous variety of different symptoms...
食物过敏会引发很多不同的症状。
Allergy to cats is one of the commonest causes of asthma.
对猫类过敏是哮喘病发作最常见的诱因之一。