His new office is on the twenty-first floor.

他的新办公室在第二十一层。

The answers will be blowing through and creating the winds of the twenty-first century.

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

Seventeen civilians were hurt. Most are students who had been attending a twenty-first birthday party.

17名平民受了伤，其中大多数是参加一个21岁生日聚会的学生。

Welcome to the twenty-first century.

欢迎进入21世纪。

What defines a twenty-first-century entrepreneur?

21世纪创业者的特征有哪些？

The battle would start the next morning — Sunday, July twenty-first.

这场战役就要在第二天早晨，即7月21日星期日打响。

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。