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)端