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