キーワード: 即時(shí)(shí)通訊___，企業(yè)(yè)(yè)溝通__，龍笛即時(shí)(shí)通__，視頻會(huì)(huì)議_______，集成開(kāi)(kāi)發(fā)(fā)(fā)____，手機(jī)(jī)端