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