Its mechanism has been summarized as "Four Systems".
关于其机制此前已有较多的总结，认定是“四制”。
What are the four most common computer-based information systems?
什么是四种最常见的电脑为基础的信息系统？
Excellent road and rail systems connect the four cities.
优良的道路及铁路系统把这四个城市连接了起来。
Is the device configured for two wire or four wire systems?
设备是配置为二线制或四线制的系统吗？
Is the device configured for two wire or four wire systems?
设备是配置为二线制或四线制的系统吗？
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