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)端