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)(jī)端