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