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)發(fā)(fā)(fā)_____，手機(jī)(jī)端