electric sign

例句：

1. 1. The electric sign is flashing red lights to alert drivers.
   这个电信号正在闪烁红灯来警告司机。
2. 2.In the old days, people used to use this kind of electric sign to indicate their presence in a particular area.
   在旧时代，人们会使用这种电信号来表示他们在某个特定地区的存在。
3. 3.The electric sign was designed to prevent accidents and improve safety on the road.
   这个电信号的设计是为了预防事故并提高道路的安全性。