Mot-clefs : 即時通訊_______________，企業(yè)(yè)(yè)(yè)(yè)(yè)(yè)溝通____________________，龍笛即時通_____________，視頻會議___________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)(fā)__________________，手機(jī)端