Well if you think it's going to last 18 months, are you going to buy 18 months worth of masks for every single person in your family?
독감이 18개월동안 낫지 않을 것이라고 생각한다면, 이 18개월간 쓸 마스크를 모든 가족구성원들을 위해 구입하시겠습니까?