キーワード: 即時(shí)(shí)通訊______，企業(yè)(yè)(yè)溝通_______，龍笛即時(shí)(shí)通__________，視頻會(huì)(huì)議__________，集成開發(fā)(fā)(fā)______，手機(jī)(jī)(jī)端