要保持一条队伍的快速运转，需要很多的收银机，而且有些商店负担不起空间和人力。
It takes many registers to keep one line moving quickly, and some stores can't afford the space or manpower.
想象一下，你只能使用一家航空公司，或者只走一条路去工作，或者在杂货店只能使用一个指定的收银台。
Imagine that you were only allowed to fly on one airline, or take a single route to work, or use one designated checkout counter at the grocery store.
进去后，他注意到有一条懒洋洋的猎犬躺在收银台旁的地上。
Inside, he noticed a harmless old hound dog asleep on the floor beside the cash register.
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