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