Supplementary information:
Vending machine, English name (Vending Machine, VEM), is a kind of machine that can automatically pay for the goods according to the input of money. Vending machine is a common equipment for commercial automation, which is not limited by time and place, and can save labor and facilitate transactions. It is a brand-new form of commercial retailing, also known as a mini-supermarket that operates 24 hours a day. Common vending machine **** is divided into four kinds: beverage vending machine, food vending machine, comprehensive vending machine, cosmetics vending machine.