Palavra chave: 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)端