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