面对超市里顾客排起的长长队列,收银员用手持设备不停地扫描着顾客购买的商品,一件,又一件……遇到“扫”不出来的时候经常出现,这时就不得不手工输入冗长的商品序列号,在长长的队列中又不时发出顾客不耐烦的埋怨声。也难怪,人在排队等候的时候,往往会感觉时间过得最慢。此时,再熟练的收银员也不禁会手忙脚乱…… The face of the supermarket queue of long lines of customers lined up, the cashier with a handheld device constantly scanning the customer to buy goods, one piece, another piece ... ... encountered “sweep ” not often appear, this When they have to manually enter the lengthy product serial number, in the long queue again from time to time customer impatience grumble. No wonder, when people wait in line, they often feel the slowest passing of time. At this point, again experienced cashier can not help but be in a hurry ...