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When we have fastfood，there are alway some important things interrupting us，maybe going to toilet or answering an important call，we need leave our seats temporarily.However,the waiters may clear the table quickly for efficiency .In fact,they don't know if we have finished yet."See you soon "is a traywhich can remind the waiters that customers need leave for a while.You just press the concave-shape side and the sign stands up，then the waiter knows it.It means our eating environment
becomes more humanized and convenient.
Dalian Minzu University
Dalian Nationalities University