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)(jī)端