Palavra chave: 即時(shí)(shí)通訊__，企業(yè)(yè)(yè)(yè)溝通_________，龍笛即時(shí)(shí)通，視頻會(huì)(huì)議__________，集成開(kāi)發(fā)(fā)(fā)(fā)____________，手機(jī)(jī)端