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。

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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。

youdao

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。

youdao

All of this is Darwinian thinking and, I think, increasingly will be central in importance in the twenty-first century.

这就是达尔文所思考的，我认为，这在二十一世纪会越来越重要。

耶鲁公开课 - 文学理论导论课程节选

What is it about the Greeks between the years that I mentioned to you that deserves the attention of people in the twenty-first century?

是什么使得久远的古希腊,会值得21世纪的人们,去关注和研究呢

耶鲁公开课 - 古希腊历史简介课程节选

Now I think that one thing Ricoeur leaves out, and something that we can anticipate as becoming more and more important for literary theory and other kinds of theory in the twenty-first century, is Darwin.

我想利科所遗漏的，也是我们预期对于,二十一世纪的文学理论和其他理论越来越重要的，是达尔文的理论。

耶鲁公开课 - 文学理论导论课程节选

Some of the issues John Kennedy faced will sound familiar to readers in the twenty-first century.

NPR: 'Let Every Nation Know': JFK in His Own Words

We heard things that simply should not be happening in the twenty-first century.

NPR: Sudan Sanctions: Too Little, Too Late?

It is my confident expectation, and more importantly it is the confident expectation of the government of the United States, that that will be very different in the twenty-first century.

WHITEHOUSE: The U.S.-India Economic Relationship in the 21st Century