Having two users is even better, but the second one can be on call for doing things like checking out live prototypes and mock-ups.
有两名用户就更好了，但是，第二名用户不必在现场，只需检查所设计的原型和模型即可。
2
Leaving the call hanging can lead to billing issues because the application is unable to process incoming call hang-ups when it is stuck waiting for a response message.
保持调用挂起可能会导致收费问题，因为当应用程序受阻塞、等待响应消息时，不能处理入站调用挂起。
3
If discipline is what he needs, let the higher-ups make that call.