Unprotected sides and edges mean any side or edge (except at entrances to points of access) of a walking/working surface, e.g., floor, roof, ramp, or runway where there is no wall or guardrail system.

• 无保护的侧面和边缘指的是没有墙或护栏系统的步行/步行表面（例如楼面、屋顶、斜面或通道）的任何侧面或边缘（除了到出入点的入口之外）。