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1·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。《柯林斯英汉双解大词典》

2·It is the twenty-first Football World Cup.

这是第二十一届足球世界杯。

3·Russia is holding the twenty-first FIFA WORLD CUP now.

俄罗斯正在举办第21届世界杯。

4·They are celebrating their daughter's twenty-first birthday in the Garden Hotel.

他们正在花园酒店为女儿庆祝21岁生日。

5·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。

6·Which country do you think will win the first prize of the twenty-first FIFA World Cup?

你认为哪个国家会赢得第21届国际足联世界杯的冠军？

7·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。

8·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。

9·Welcome to the twenty-first century.

欢迎进入21世纪。

10·What defines a twenty-first-century entrepreneur?

21世纪创业者的特征有哪些？