Language points

1. First aid is the first kind of help given to someone who suddenly falls ill or gets injured before a doctor can be found.

①first aid “急救” 知识拓展 give/offer aid 援助                come to sb.'s aid 帮助某人 cut off aid （突然）终止援助        a hearing aid 助听器 teaching aids 教具                 medical aid 医疗救护 with the aid of 借助于