キーワード: 即時(shí)通訊______________，企業(yè)(yè)(yè)(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)(fā)(fā)(fā)__________________________，手機(jī)(jī)(jī)端