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