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(jī)(jī)端