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