Cách sử dụng
The word 'door' is used to describe a movable barrier that closes an entrance or a room. It is typically made of wood or metal, and can be opened and closed by turning a handle or pulling a lever. Doors are usually found in homes, offices, and other buildings, and are used as a way to separate spaces or rooms. For example, you might say "Close the door behind you" when someone enters a room or "Knock on the door before entering" to show that you should ask for permission before entering a room.