キーワード: 即時(shí)通訊_，企業(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)___________，手機(jī)端