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