キーワード: 即時(shí)(shí)通訊_______________，企業(yè)(yè)(yè)(yè)(yè)(yè)溝通____________，龍笛即時(shí)(shí)通___________________，視頻會(huì)議_______________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)__________，手機(jī)(jī)端