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