1. 置于前面的：prefixed to 放在...的前面 | prefixion 置于前面的 | preform 预先形成
1. Application results show that the prefixion syste m satisfies the operation requirements of dispatch automation system.
实际运行情况表明，前置系统的设计和配置是符合调度自动化系统实际运行要求的。
2. Its dispatch automation and centralized control automation sharing a prefixion system.
其调度自动化与集控自动化共享一套前置系统。
3. Scheme and research of prefixion system in dispatch automation system in Dongguan City
东莞调度自动化系统中前置系统的配置与研究