キーワード: 即時(shí)通訊_______________，企業(yè)(yè)(yè)(yè)(yè)(yè)溝通_______________，龍笛即時(shí)通_______，視頻會(huì)議___________________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)______________________，手機(jī)端