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"Men" and "Hu" are two very old characters, which are common in Oracle Bone Inscriptions and are also the first-class characters of Chinese common norms.

The explanation of "Door", "Household" and "Shuowen Jiezi" says: "Door, smell also. From two families. " "Home, too. Half a door is a household. " It can be seen that both "door" and "household" are meant to be what we call "door" now, but there is a difference between "door" and "household". Two doors are doors and one door is a door. The word "door" in Oracle Bone Inscriptions is like two gates, and "door" is a door.

Now the understanding of "door" is basically consistent with the ancient meaning, which refers to the entrance and exit of houses, vehicles and boats or places surrounded by walls and fences, as well as obstacles installed at the entrance and exit that can be opened and closed, such as front doors, house doors, iron gates and fence doors.

At present, there are many contexts that understand "household" as family, hukou and household registration, such as every household, household and settled down. When the door is not quite understood, it will generally remain in idioms, such as not closing the door at night, not opening the door, and the door is scattered.

Nowadays, many people live in buildings, and the floor doors and bedroom doors are single doors. According to classical Chinese, it should be called "household" In the past, people lived in bungalows with small yards, and each family basically had "doors" but no "households". Whether it is the courtyard door, the main house or the house door, it is a pair of wooden doors, and there are few single doors.

At that time, wooden doors had many components. Take the courtyard gate as an example, there is a pier from bottom to top. The role of the pier is to form a gap between the door and the ground to protect the door, and then place the door shaft below. There is a gate in the middle of the dock, which is installed at night and taken down during the day to facilitate passage. Above the pier is a door frame, and above the door frame is a door string. Above the door string is a thick wooden board, flat, as wide as the wall, built into the wall. It is called a compressor fan. Two ends of the pressing fan are provided with round holes, and the door shaft on the pressing fan passes through the round holes. This round hole of the compressor fan is equivalent to the jacket of the current bearing. Some people don't need to press the fan, so they have to nail it to the door frame with a U-shaped shovel made by the furnace maker as a "load-bearing jacket". We call it "Hehe" (dialect, with sounds but no words). The left door at the upper part of the gate is equipped with a door nose, and the right door is equipped with a ruthenium door for locking the door. Inside is the door sleeve, which is used to insert the door. Outside the door is a hinge, commonly known as the door turn (? Turn to read four tones and read softly).

The difference between the main entrance and the courtyard door is that there is no door in the middle of the pier, but a door string (door railing or threshold), which is dead. A wooden board is blocked under the door string, and a small gap is made on one side of the wooden board, which is called the cat lane to let cats in and out.

There are also special seasons to install a single door in a special family, which is the "air door" used in winter. This is a single door, different from a double wooden door. The upper part is a window lattice, which is usually made of paper paste, and the lower part is a thin board. There is a bend on one side, hanging on the door frame. The "bearing sleeve" at the throttle corner must be "iron". Rectangular wooden frames are easy to be broken after a long time, so a wire is often pulled between the upper axis of the door and its diagonal to prevent the diagonal from sagging. There is also a damper with a frame. The door frame is actually a window lattice surrounded by glass on both sides and a door in the middle. The upper part of the door is window lattice, glass and the lower part is inlaid with wood. You must use hinges to install this kind of door.