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(huì)(huì)議___________，集成開發(fā)(fā)(fā)(fā)(fā)，手機(jī)(jī)端