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