自动售货机：先投入一定数目货币，然后根据货币购买力进行相应货物的选择，然后确定购买，出货并找零，完成交易。也可在确定购买前任何时刻按取消键退出所有货币。-Vending machine: put a certain number of first currency, and then carried out in accordance with the corresponding purchasing power of money to choose the goods, and then determine the purchase, shipment and give change, complete the transaction. Can also be determined at any time before buying to exit by the abolition of all currencies.