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)端