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