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