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(kāi)發(fā)(fā)(fā)(fā)(fā)______，手機(jī)(jī)端