Schlüsselwort: 即時(shí)(shí)通訊___，企業(yè)(yè)(yè)(yè)溝通_____，龍笛即時(shí)(shí)通_______，移動(dòng)(dòng)辦公_，集成開(kāi)(kāi)發(fā)(fā)(fā)(fā)