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