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)發(fā)(fā)(fā)________，手機(jī)(jī)(jī)端