in one's twenties
表示二十到二十九岁这个年龄段时用复数 twenties，one's 随主语的人称变化。
My brother learned to drive in his twenties.
我哥哥二十多岁时学会了开车。
二十至二十九的数字；二十美元纸币；10-20（位置）；从二十(20)到二十九(29)的数字。；10-20(位置)。
the number 20
从二十(20)到二十九(29)的数字。
The numbers twenty (20) to twenty-nine (29).
二十
the cardinal number that is the sum of nineteen and one
10-20(位置)。
10-20 (location).
二十美元纸币
a United States bill worth 20 dollars
I paid for the meal with a twenty and got some change.
我用一张二十美元钞票付了餐费，并找了些零钱。
用法提示：twenty 作为名词，指一张二十美元纸币，作介词 with 的宾语。
She asked the cashier to break a twenty into smaller bills.
她让收银员把一张二十美元纸币换成零钱。
用法提示：twenty 作为名词，指二十美元纸币，作动词 break 的宾语。
He found several twenties in the old wallet.
他在旧钱包里发现了几张二十美元钞票。
用法提示：twenties 是 twenty 的复数形式，指多张二十美元纸币，作动词 found 的宾语。
表示二十到二十九岁这个年龄段时用复数 twenties，one's 随主语的人称变化。
My brother learned to drive in his twenties.
我哥哥二十多岁时学会了开车。
用于指某个特定群体中的二十个，后面通常接 the、these、my 等限定词。
Twenty of the thirty seats were already taken.
三十个座位中已有二十个被占了。
口语中 a twenty 指面值二十美元的纸币，复数形式为 twenties。
She handed the cashier a twenty.
她递给收银员一张二十美元的钞票。
grammar · medium
易错句子She is in her twenty.
正确表达She is in her twenties.
表示年龄段的“二十多岁”时，要用 twenty 的复数形式 twenties（in one's twenties），不能用单数 twenty。
grammar · medium
易错句子Twenty dollars are enough for dinner.
正确表达Twenty dollars is enough for dinner.
金额、距离、时间等虽由复数形式构成，但被当作一个整体数量时，谓语要用单数 is，而不用 are。
grammar · medium
易错句子Today is my twenty birthday.
正确表达Today is my twentieth birthday.
表示“第二十个”这样的顺序时，要用序数词 twentieth，而不是基数词 twenty。
在二十多岁时
She traveled the world in her twenties.
她二十多岁时环游了世界。
全天候；一直
The hotline is available twenty-four seven.
这条热线全天候提供服务。
2.0的视力；完美视力
The pilot has twenty-twenty vision.
这名飞行员视力2.0。
二十美元钞票
He handed the cashier a twenty-dollar bill.
他递给收银员一张二十美元的钞票。
二十个问题（游戏）
The children played twenty questions on the car trip.
孩子们在车上玩二十个问题游戏。
百分之二十
Twenty percent of the students failed the exam.
百分之二十的学生考试不及格。
Choose the next layer that will help you use twenty with more confidence.
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