four-function public address equipment

例句：

1. 1.This new model of four-function public address equipment is more efficient than the previous one.
   这款新型四功能公共广播设备的效率比以前的型号更高。
2. 2. The company has developed a four-function public address equipment that can be used in various environments.
   该公司开发了一种可以在各种环境中使用的四功能公共广播设备。
3. 3. The four-function public address equipment was installed at the entrance of the school to provide clear and loud announcements for students and staff.
   这种四功能公共广播设备被安装在学校的入口处，为学生和员工提供清晰且响亮的公告。