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