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)(jī)端