キーワード: 即時(shí)(shí)通訊_______________，企業(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)_____________，手機(jī)(jī)端