キーワード: 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