キーワード: 即時(shí)(shí)通訊__________，企業(yè)(yè)(yè)(yè)(yè)溝通________，龍笛即時(shí)(shí)通_________，視頻會議_____，集成開發(fā)(fā)(fā)(fā)(fā)_______，手機(jī)(jī)端