キーワード: 即時(shí)(shí)通訊____，企業(yè)(yè)(yè)(yè)(yè)(yè)(yè)溝通________，龍笛即時(shí)(shí)通________________，移動(dòng)辦公____________，集成開發(fā)(fā)(fā)(fā)(fā)(fā)(fā)