キーワード: 即時(shí)(shí)通訊__，企業(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)____________，手機(jī)(jī)端