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