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