Schlüsselwort: 即時(shí)通訊______________，企業(yè)(yè)(yè)(yè)(yè)溝通____________，龍笛即時(shí)通___________，視頻會(huì)議________，集成開(kāi)發(fā)(fā)(fā)(fā)(fā)___________________，手機(jī)端