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)發(fā)(fā)(fā)(fā)