电表按流量收费，私人用品和厨房的毛巾则是免费的。
Gasand electricity are metered, personal and kitchen towels are not provided.
存在两种使用支付Web服务进行收费的模式：按流量收费和按批量收费。
There are two modes for charging with the Payment Web service: charge by amount and charge by volume.
几个城市安装了动态收费系统，按交通流量收费不同。
Several cities have installed dynamic toll systems whose charges vary according to traffic flow.
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