キーワード: 即時(shí)通訊____________________，企業(yè)(yè)(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)(fā)(fā)___，手機(jī)(jī)(jī)端