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(kāi)發(fā)(fā)(fā)(fā)(fā)_________________，手機(jī)(jī)端