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