Palavra chave: 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)端