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。
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。
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。
Welcome to the twenty-first century.
欢迎进入21世纪。
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。
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。
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。
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。
"It promises to be one of the great undertakings of the twenty-first century," writes Mr. Baker.
“这绝对是21世纪最伟大的事业之一。”Baker先生说。
Thomas L. Friedman, The World is Flat: A Brief History of the Twenty-first Century, Picador: 2007.
ThomasL.Friedman，世界是平的：二十一世纪简史，Picador：2007 年。
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。
The first decade of the twenty-first century has been defined by our insatiable demand for information.
21世纪的第一个十年已经因为我们永不满足的信息需求而被重新定义。
At the beginning of the twenty-first century, he could note that UNESCO had joined him in this conviction.
在二十一世纪之初，他注意到联合国教科文组织已经同他一道对此深信不疑。
The development of such a telescope will be one of the great astronomical projects of the twenty-first century.
而开发这样一台望远镜将会是21世纪天文学的一个重要的研究课题。
If it's going to happen, it would be the biggest of all outbreaks the world has faced in the twenty-first century.
如果发生，将是21世纪以来人类面临的最大一次流感爆发。
We need to honor their desire to learn useful skills that are going to be relevant to the twenty-first century world.
我们应该尊重他们渴望学习与21世纪世界有关的有用技能的要求。
This wall of garbage orbiting us all seems like a symbol of the great dilemmas facing humanity in the twenty-first century.
这堵围着我们转的垃圾墙好似一个象征，它象征了21世纪的人类所面临的巨大的两难困境。
Of the millions who sawHaley’s comet in 1986, how many people will live long enough to see itreturn in the twenty-first century.
1986年看见哈雷慧星的千百万人当中，有多少人能够长寿到足以目睹它在二十一世纪的回归呢？
They are doing this in the context of defining and confronting major underlying causes of ill-health in the twenty-first century.
他们在这样做的同时，还确定并对付二十一世纪中健康不良的主要根源。
The capacity to respond to health threats quickly with well-coordinated action is indispensable for public health in the twenty-first century.
在二十一世纪中，以协调良好的行动迅速应对卫生威胁的能力对于公共卫生是必不可少的。
Warm waters passing through the strait into the Arctic Ocean might have helped reduce sea ice extent since the turn of the twenty-first century.
自从新世纪开始，通过白令海峡进入北冰洋的温暖海水，已经开始限制海冰的范围。
The explosion in urban population looks set to continue through the twenty-first century, presenting challenges and opportunities for scientists.
城市人口在二十一世纪持续激增似乎已成定局，这给科学家们带来了更多的挑战和机遇。
The explosion in urban population looks set to continue through the twenty-first century, presenting challenges and opportunities for scientists.
城市人口在二十一世纪持续激增似乎已成定局，这给科学家们带来了更多的挑战和机遇。
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