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.
它们还被授权可以尝试不同的收费模式——换句话说，开始按照流量收费而不是按一个统一的标准收费。
They have also been granted the freedom to experiment with different pricing models-in other words, start charging by the Megabyte instead of offering a flat rate.
它们还被授权可以尝试不同的收费模式——换句话说，开始按照流量收费而不是按一个统一的标准收费。
They have also been granted the freedom to experiment with different pricing models-in other words, start charging by the Megabyte instead of offering a flat rate.
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