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)(jī)(jī)端