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