For students' parents To pay attention to measures to avoid allergens for children, especially those with a history of personal allergies (neonatal eczema, urticaria, asthma) or a history of family allergy; Recommended measures: Keeping the bedroom clean; closing the bedroom window, using air conditioner; Do not keep pets in the house; Do not use items from feathers; To pay attention to measures to keep children warm when the weather changes.