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