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