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(huì)議_____，集成開發(fā)(fā)(fā)(fā)(fā)(fā)___，手機(jī)端