A Japanese city is keeping track of elderly dementia sufferers by attaching barcodes containing personal information to their fingers and toes, officials say. 据官方表示,日本一座城市通过将包含个人信息的二维码粘贴到使用者...
You've probably bought groceries and seen the cashier scan an item to get its price. It works because each product has a code that's a shortcut. It prevents the cashier from having to look up each item. 你应该买过东西,也应该看过收银员通...