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