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)端