キーワード: 即時(shí)通訊___________，企業(yè)(yè)(yè)(yè)(yè)(yè)溝通_________，龍笛即時(shí)通_______________，視頻會議_________________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)______________，手機(jī)端