キーワード: 即時(shí)通訊_________，企業(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)________________，手機(jī)端