キーワード: 即時(shí)通訊_____________________，企業(yè)(yè)(yè)(yè)(yè)(yè)溝通____________________，龍笛即時(shí)通______________，視頻會議________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)_______________，手機(jī)(jī)端