Schlüsselwort: 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)端