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(kāi)發(fā)(fā)(fā)(fā)(fā)(fā)__________，手機(jī)端