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