キーワード: 即時(shí)通訊_______，企業(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)______，手機(jī)(jī)端