Mot-clefs : 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)(jī)端