1. A semi-trailer is a trailer with its axle placed behind the vehicle's center of gravity (when the vehicle is uniformly loaded) and equipped with a coupling device that can transmit horizontal and vertical forces to the towing vehicle. A semi-trailer is generally a three axle semi-trailer, which can be divided into many types such as eleven meter compartment semi-trailer, thirteen meter compartment semi-trailer, low flatbed semi-trailer, etc.

2. The meaning of a semi-trailer is that the vehicle itself has a cargo box, but for convenience, a cargo box is dragged behind it, and the last cargo box can be separated. This type of vehicle is called a semi-trailer. Full trailer: As the name suggests, the rear cargo box can be separated and needs to be towed by a front end.

3. A semi-trailer is a trailer with its axle placed behind the vehicle's center of gravity (when the vehicle is uniformly loaded) and equipped with a coupling device that can transmit horizontal or vertical forces to the towing vehicle. That is, a portion of the total weight of the trailer is borne by the towing vehicle.

4. Explanation of Trailer: A vehicle that has no power and is pulled by a locomotive or car without a power unit. Explanation of word decomposition: Hanging (hanging) - Using ropes, hooks, nails, etc. to attach an object to a high place or to another object: hanging.

5. A semi-trailer is connected to the towing seat of a tractor through a towing pin. A common container transport vehicle is a typical semi-trailer train, and the rear loading part is the semi-trailer. There are also differences in usage. Full trailers are mainly used for short distance transportation in factories, ports, docks, warehouses, and other areas, while semi trailers are mainly used for long-distance transportation of goods.