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1·Many doctors feel that this is a problem in the twenty-first century.

许多医生认为这是21世纪的一个问题。

2·The task facing medicine in the twenty-first century will be to redefine its limits even as it extends its capacities.

21世纪医学面临的任务将是重新定义其限制，即使它扩大了其能力。

3·Geothermal energy probably will not make large-scale contributions to the world energy budget until well into the twenty-first century, if ever.

如果可能的话，进入了21世纪之后，地热能才会对世界的能量预算做出大规模的贡献。

4·Welcome to the twenty-first century.

欢迎进入21世纪。

5·But in the twenty-first century, a very different story is unfolding.

但在21世纪，呈现在大家面前的又是另外一种故事。

6·I have no doubt that America can compete-and succeed-in the twenty-first century.

毋庸置疑，我认为美国有实力参与21世纪的竞争并取得成功。

7·The twenty-first century began with a very unequal distribution of power resources.

21世纪初，权力资源分布相当失衡。

8·We had built and crossed our bridge to the twenty-first century, and were not going back.

我们已经建立并跨过了通往21世纪的桥梁，并且，我们不会走回头路。

9·Thomas L. Friedman, The World is Flat: A Brief History of the Twenty-first Century, Picador: 2007.

Thomas L. Friedman，世界是平的：二十一世纪简史， Picador：2007 年。

10·The answers, my friends, will be blowing through and creating the winds of the twenty-first century.

我的朋友，这些问题的答案将主导二十一世纪的风向，并将贯穿整个世纪。