SCIENCE STUDY

Easy come, easy go

作者：TEENS

无人超市隐藏了什么样的“黑科技”？

Imagine you walk into a store. Strangely enough, you see no staff (店员) inside. You pick up things and prepare to wait in line and pay. But even more oddly, there is no cashier (收银员) at all. So what has happened to this store?

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