An exit desk operator who can free a previously allocated car slot, charge the leaving customer accordingly and record exit times.
出口服务台操作员，清空一个不再使用的停车位，向离开的客户收取相应费用并记录离开时间。
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It follows that if we guide air through a narrowing slot it must go faster and faster to get through and if the exit is smaller than the entrance we have a definite suction at the exit.