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