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)(huì)議______________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)_________，手機(jī)(jī)端