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