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)(jī)端