PartⅡ Sample Dialogue
A：Do you know how many systems are included in a metro signaling system and what they are?
B：It contains six systems，moving block system，train testing system，automatic train protect system，automatic train operation system and automatic train supervising system.
A：What is the relationship between ATC and signaling system?
B：ATC system has three subsystems—ATO，ATP，and ATS.They are part of a metro signaling system，and ATC supports signal system and signaling system controls ATC.
A：That means metro signaling system has the same functions as ATC?
B：Yes.It is not only safe for metro operation，but also convenient for passengers.
A：Passengers can read the information display on the platform.
B：You can learn what time next train will arrive，route and direction，etc.Also，some more information like weather report，road conditions are available.
A：How powerful the system is.
对话
A：你知道地铁信号系统包括哪些系统吗？它们是什么？
B：包括六个系统：移动闭塞系统、列车测试系统、列车自动保护系统、列车自动运行系统和列车自动监控系统。
A：ATC与信号系统的关系是什么？
B：ATC系统有ATO、ATP和ATS三个子系统，它们是地铁信号系统的一部分。ATC支持信号系统，信号系统控制ATC。
A：这意味着地铁信号系统与ATC具有相同的功能吗？
B：是的。它不仅为了地铁运行安全，而且也为了方便乘客。
A：乘客可以阅读站台上的信息显示。
B：你可以了解下一班火车什么时候到达、路线和方向等。此外，还可以了解更多信息，如天气预报、道路状况等。
A：这个系统真是很强大。