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