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