If you are allergic to something, you become ill or get a rash when you eat it, smell it, or touch it.
I'm allergic to cats.
我对猫过敏。
people with asthma who are allergic to dust mites.
有哮喘病并对尘螨过敏的人。
If you have an allergic reaction to something, you become ill or get a rash when you eat it, smell it, or touch it.
Soya milk can cause allergic reactions in some children.
豆奶会导致有些儿童起过敏反应。