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)(jī)端