在一个流量控制系统中同时设计实现确保服务、奖赏服务、尽力而为服务三种业务类型，可以同时满足不同的流量控制需求。
The traffic control system have Premium Services and Assured Services and Best Effort Service, it can meet different traffic control requirements.
网络提供者们不担保某种程度的服务质量，仅承诺将尽力而为，这可能对个人电邮不算什么，但是对时间敏感的数据比如视频就很重要了。
Network providers do not guarantee a certain quality of service, but merely promise to do their best. That may not matter for personal e-mails, but it does for time-sensitive data such as video.
然而，传统的因特网提供的是一种尽力而为的服务。
However, traditional service provided by Internet is a kind of best effort service.
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