キーワード: 即時(shí)(shí)通訊_______，企業(yè)(yè)(yè)溝通___，龍笛即時(shí)(shí)通_________，視頻會(huì)(huì)議__，集成開(kāi)(kāi)發(fā)(fā)(fā)________，手機(jī)(jī)端