stairstep signal

例句：

1. 1.The staircase is illuminated by a stairstep signal, making it easier for people to navigate.
   楼梯间有一个楼梯信号，使得人们更容易导航。
2. 2.In this new building, the stairstep signals are designed to be more energy-efficient.
   在这个新建筑中，楼梯信号的设计更加节能。
3. 3. The stairstep signal system was installed to improve safety and accessibility in the building.
   安装楼梯信号系统是为了提高建筑物的安全性和可访问性。