Schlüsselwort: 即時(shí)通訊__________________，企業(yè)(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)(fā)___________，手機(jī)(jī)(jī)端