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