Picture a door that was once open to only one half of the people, and is now open to both. In the oldest use it is a school door: boys and girls walking into the same building, sitting in the same rooms, taking the same lessons. Every other use of the word keeps that picture and changes what the door belongs to — a gym, a team, a dormitory — or else points at one of the people who walked through it.
coed 可以想成一扇原本只開給一半人的門，現在兩邊都走得進去。最早的畫面是學校的門：男生女生走進同一棟樓、坐同一間教室、上同一堂課。之後的用法都留著這個畫面，只是把門換成別的地方——健身房、球隊、宿舍；再不然，就是指走進那扇門的其中一個人。
登入就可以看每一支怎麼連回核心畫面。