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)(jī)(jī)端