短語詞組短語subway signal system 地鐵信號系統(tǒng)subway communication system 地鐵通信傳輸系統(tǒng)subway AFC system 地鐵AFC系統(tǒng)subway operation system 地鐵運(yùn)營系統(tǒng)subway industry system 地鐵工業(yè)體系Subway clock system 地鐵時鐘系統(tǒng)subway ventilation system 地鐵通風(fēng)系統(tǒng)Independent Subway System 獨立地鐵系統(tǒng)negotiating the subway system 艱難地穿過地鐵 返回 subway system