キーワード: 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