短语词组短语bcn -beacon- 信标BCN -business computer network 商业计算机网络c -BCN 立方硼碳氮;立方BCNPVG -BCN 上海h -BCN 硼碳氮PEK -BCN 巴塞罗那o -BCN 类金刚石结构HKG -BCN 香港 返回 BCN