External spiral escape stairs are made of steel and for safety reasons around the ladder there is a steel frame and the protective mesh.

而外凸的旋转疏散楼梯采用钢制结构，为了安全起见，阶梯被一圈钢制框架包裹。

youdao

There sets many mesh spots and V type slots on the back surface, the exit surface has many even ladder type prisms structure.

其中，该导光板的底面分布有许多网点或V形槽，该出射面具许多均匀排布的梯形台状棱镜结构。

youdao

The device combined with the rotary actuator, mesh belt, radiator, axial-flow fan, automatic controller and body. The mesh belt have three ladder configuration.

设备由传动装置、网带、散热器、轴流风机、自动控制器、箱体组成。

youdao