1
be younger than sb/sth
比较级younger后接than引出比较对象，可用two years等说明具体差距。
She is two years younger than her sister.
她比她妹妹小两岁。
年纪较小者；较年轻的人
先理解核心含义，再看它在真实句子里的用法。
年纪较小者；较年轻的人
a younger person, especially one of two people with the same name (as a son named after his father)
She is two years younger than her sister.
她比她妹妹小两岁。
比另一个人年轻的人。
One who is younger than another.
My sister is three years younger than me.
我妹妹比我小三岁。
The younger players on the team are very eager to learn.
队里较年轻的球员们非常渴望学习。
These shoes look younger and more stylish than those boots.
这双鞋看起来比那双靴子更年轻、更时尚。
比较级younger后接than引出比较对象，可用two years等说明具体差距。
She is two years younger than her sister.
她比她妹妹小两岁。
指两个人中较年轻的那个，可后接of短语说明范围。
He is the younger of the two brothers.
他是两兄弟中年纪较小的一个。
用于人名之后，指同名者中较年轻的一位，常用来区分父子或同名的两个人。
Pliny the Younger is famous for his letters.
小普林尼以其书信闻名。
Not this
She is more young than her sister.
Use this
She is younger than her sister.
young是单音节形容词，比较级应直接加-er构成younger，不能用more young。
Not this
He is the younger of the three brothers.
Use this
He is the youngest of the three brothers.
两者比较用比较级younger，三者及以上比较用最高级youngest。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
弟弟
My younger brother is a doctor.
我弟弟是一名医生。
妹妹
Her younger sister lives in Shanghai.
她妹妹住在上海。
年轻一代
The younger generation prefers digital communication.
年轻一代更喜欢数字交流。
年幼的孩子
Younger children need more sleep than teenagers.
年幼的孩子比青少年需要更多睡眠。
年轻时代；早年
In my younger years, I lived abroad.
在我年轻的时候，我住在国外。
年轻时的自己
Don't be too hard on your younger self.
不要对年轻时的自己太苛刻。
较年轻的人群；年轻一代
The younger set tends to prefer streaming over cable.
较年轻的人群往往更青睐流媒体，而不是有线电视。
看起来（或感觉）比实际年龄年轻
At 50, she looks younger than her years.
她五十岁了，看起来却比实际年龄年轻。
过去的自己；更年轻时的自己
He wrote a letter to his younger self.
他给年轻时的自己写了一封信。
你比春天还要年轻。
She looks at least ten years younger in that dress.
她穿上那件连衣裙，看起来至少年轻了十岁。
Use younger naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想记忆：young（年轻）加上比较级后缀 -er，就是“更年轻的”。画面：两株幼苗，younger 的那株更鲜嫩。
语域：neutral 常见场景：日常交流、书面表达、正式场合 “younger”作形容词时表示“较年轻的”，作名词时表示“年龄较小的人”；整体语体偏中性，日常与书面场合均常用，其中名词用法较多出现在家庭或身份对比等语境中。
younger 本身已是比较级，不要再与 more 连用。作名词时通常与 the 连用，指两者中较年轻者。
Dictionary facts from ECDICT, WIKTIONARY.