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