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)(jī)端