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1·He was stricken at twenty-one with a crippling malady.

二十一岁时腿瘸疾病让他受到重击。《柯林斯英汉双解大词典》

2·I was twenty-two – no, twenty-one.

我那时22岁。—噢不，21岁。《柯林斯英汉双解大词典》

3·We waited twenty-one years, don't fail us now.

我们等了21年，如今不要辜负我们。《柯林斯英汉双解大词典》

4·The government implemented a rule that the guinea is worth twenty-one shillings.

政府实施了一项规定，即一几尼价值21先令。

5·I went the wrong way when I was twenty-one, and have never found the right path again.

我21岁时走错了路，再也没有找到正确的路。

6·Since its beginning, the program has now grown and has twenty-one therapy dogs and a therapy cat.

从一开始，这个项目就不断扩大，现在有21只治疗犬和一只治疗猫。

7·I have kept a record of informal conversations involving some 300 students from at least twenty-one colleges and universities.

我记录了来自至少21所高等院校的300名学生的非正式谈话。

8·The crown of thorns starfish is large, twenty-five to thirty-five centimeters in diameter, and has seven to twenty-one arms that are covered in spines.

棘冠海星很大，直径长达25到35厘米，有7到21条手臂，上面布满了刺。

9·That twenty-one ceramic dog figurines were discovered during the excavating of a 1,000-year-old Hohokam village in Tempe, Arizona, has nearly doubled the number of these artifacts known to exist.

在对亚利桑那州坦佩的霍霍坎村进行挖掘时，发现了21件陶制狗像，这使得已知的狗像数量增加了近一倍。

10·Open your book at Page twenty-one.

把书翻到第二十一页。