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