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)(jī)(jī)端