Mot-clefs : 即時通訊__________________，企業(yè)(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)(fā)_____________________，手機端