In the control of large scale group-machine, in order to control and dispatch mobile engineering machines, the control center must know the information about them.
在大规模的机群控制中，主控站必须了解各个控制车辆的位置和状态信息，以便对所有车辆进行调度和控制。
Definition: a system of paying for goods or services by moving a credit card or mobile phone in front of a special machine which automatically reads the information.
定义：一个自动付费系统，消费者只需要在特殊的机器前挥动信用卡或手机，信息就会自动被读取。
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