When the subscriber begins to answer, the telephone link to the subscriber has been established and the chargingperiod comes into effect.
当用户回答时，便意味着到用户的电话线路已经建立，并且开始计费。
2
Peak-load pricing — Charging resource users during the peak period the higher cost of supplying resources during that period.
负载峰值定价——在峰值期间内交给使用者更高的供给资源成本。
3
Each of the vehicles are designed to be able to switch to " battery mode, " so they can depart from the charging strips and drive anywhere at all for a limited period of time.