短語詞組短語grade separated crossing 分隔過路處grade pedestrian crossing 地面行人過路處at grade pedestrian crossing 地面行人過路處grade roundabout crossing 平面環(huán)形交叉路口at -grade pedestrian crossing 地面行人過路處separate grade crossing 立體交叉道grade -separated crossing 分層過路處at grade crossing 平面交叉protective grade crossing 防護(hù)道口 返回 grade crossing