Open your book at Page twenty-one.
把书翻到第二十一页。
你是21岁吗？
二十加一等于二十一。
We bought twenty-one bags of rice.
我们买了二十一包年夜米。
I: Are you twenty-one years of age?
I：你今年21岁吗？
There are twenty-one boys in my class.
你们班的男生在哪里?。
He is twenty-one and his name is Geoff.
他是二十一和他的名字是杰夫。
Next month my sister will be twenty-one.
下个月我姐姐就二十一岁了。
二十一人，爸爸。
“第二十一名”。
I wrote three books before I was twenty-one.
我二十岁之前就写了三本书。
You lost by only a hundred and twenty-one votes.
你仅仅以一百二十一票的些微差距输了。
You lost by only a hundred and twenty-one votes.
仅仅以一百二十一票的微弱差距输了。
A boy of the same age: about twenty or twenty-one.
这个男孩和方廷的年龄一样：大约二十或二十一岁。
So it is called as new material of twenty-one century.
被誉为是二十一世纪的新材料。
I was twenty-one that day, in the golden age of my life.
那一天我二十一岁，在我一生的黄金时代。
Yet only twenty-one percent of their population is online.
然而，上网的总人数仅占总人口的21%。
Judge: Competitor number twenty-one, thank you very much indeed for that.
评委：第二十一号选手，真的非常感谢你。
He spent about twenty-one hours in space. He did a lot of work there.
他在太空中度过了大约二十一个小时。在那儿他做了很多工作。
This week, the company proposed cutting twenty-one thousand more factory jobs.
本周，通用提议削减两万一千个工作岗位。
At twenty-one he took his degree-a respectable degree, but not a very high one.
二十一岁他获得了一个不很高，但也令人钦羡的学位。
I still remember that moment. There was only twenty-one dollars left in my bank account.
我仍然记得那时候，银行存款里只剩二十一圆。
Stanford was one of twenty-one American universities that took part in the contest this year.
斯坦福大学是今年参加这次竞赛的21所美国大学中的一所。
二十减一等于十九。
Twenty cents is a fifth of one dollar.
二十美分是一美元的五分之一。
I count he runs fifteen or sixteen circles, even near twenty circles one time.
我估计他一次要跑十五六圈，或二十圈。
Twenty one people have been rescued.
目前已有21人获救。
Twenty one people have been rescued.
目前已有21人获救。
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