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