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