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