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___________________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)(fā)____________，手機(jī)端