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