1.
I was already in a high position when I was in my 20s.
我二十几岁就做大官了，
2.
In their teens and 20s they're trying to prove themselves... impulsive.
他们在十几岁和二十几岁时都试图显示自己…容易冲动。
3.
Didn't we start doing significant work in our early twenties?
还不是二十几岁就做大工作了。
4.
For men in their fifties, their chance of fathering an autistic child is 9 times the risk of men in their teens and twenties.
50多岁的男子，他们抚育出自闭症儿童的可能性是十几岁和二十几岁的男子的9倍。
5.
I was already in a high position when I was in my 20s. I didn't know as much as you do now, but I managed.
我二十几岁就做大官了，不比你们现在懂得多，不是也照样干？
6.
Rao proved to be a handsome, dark-skinned, articulate and fast-speaking young man, still in his twenties.
拉奥是个皮肤黝黑的英俊青年，只有二十几岁，口齿伶俐，讲话很快。
7.
How old are you? I am twelve (years old).
你几岁？我十二岁。
8.
How old will you is on December 31of this year?
到今年十二月三十一日时你将几岁?
9.
For men in their 50s, their chance of fathering an autistic child is nine times the risk of men in their teens and 20s.
50多岁的父亲生育孤独症儿童的风险比十几二十岁的父亲高9倍。
10.
How old is your sister? She is thirteen years old.
你的姊妹几岁？她十三岁。
11.
How old are you? I am ten.
你几岁了？我十岁了。
12.
"Twenty - almost twenty-one.
“二十岁——差点二十一。
13.
(of a child)nearly five, twelve,etc years old
（指儿童）近五岁、十二岁等.
14.
She said she was only twenty-two --- twenty-two my eye!
她说她只有二十二岁--二十二岁, 胡说八道!
15.
She said she was only twenty-two--- twenty-two my eye!
她说她只有二十二岁－－二十二岁，胡说八道!
16.
The best period for a person to study is between the ages of 18 and 20.
十八岁到二十岁正是学习的最好时期。
17.
a teen-age set
一批十几岁的青少年
18.
Mr. Smith is still in his forties.
史密斯先生才四十几岁。