服务用户未在服务所有者或维护者处进行注册，因此没有人知道谁是用户以及有多少用户。
Service users are not registered with service owners or maintainers, and so no one knows who the users are or how many there are.
因此，我们倾向于尽可能少用网络。
Our tendency, therefore, has been to use the network as sparingly as possible.
老人很早就休息，因此很少用电。
Elderly people go to bed early, so they use less electricity.
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