キーワード: 即時(shí)(shí)通訊___，企業(yè)(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)(fā)____，手機(jī)(jī)端