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.
双语例句
例： Food allergies can result in an enormous variety of different symptoms.
食物过敏会导致大量不同种类的症状。
例： Allergy to cats is one of the commonest causes of asthma.
对猫过敏是哮喘病最常见的诱因之一。