juvenile
单词辨析：
指人、动植物幼小、未成熟的。
young animals/children/trees
幼畜/幼儿/小树
The young seedlings grow very fast.
秧苗长得很快。
The young lion stood beside its mother.
小狮子站在母狮的身旁。
He is too young to join the army.
他年龄太小，还不能参军。
指介于儿童和成年人之间的，强调不成熟、叛逆等特点，无比较级。
adolescent attitudes/boys/crises
青春期心态/男孩/危机
Man is still only adolescent.
人类还只是处于青少年时期。
His remarks about the matter struck me as being a bit adolescent.
他对此事的意见让我觉得有点幼稚。
作“少年的”解时，系法律术语，只作定语；作“幼稚的”解时，强调不成熟的。
a juvenile criminal/offender
少年犯
a very juvenile sense of humor
很幼稚的幽默感
Deak is an expert in juvenile delinquency.
迪克是研究青少年犯罪的专家。
The mother is tolerant of her son's juvenile behaviour.
母亲对儿子的幼稚行为非常宽容。
指为年轻人所特有的或看上去年轻的。
youthful enthusiasm/rebellion/vigour
年轻人的热情/叛逆/活力
The photo shows a youthful, sweet Emma.
照片里的埃玛年轻而甜美。
She is over 60 but has a youthful complexion.
她已经年过六旬，但面容依然姣好。
No one can remain youthful forever.
没有人能永葆青春。
现在几乎专指年轻的男性，尤用于报纸上，常含贬义。但作为集合名词时，男女青年皆可指，且无贬义。
The street fight was started by a gang of youths.
这场街头打斗是由一伙少年挑起来的。
There are groups of youths playing basketball over there.
成群的小伙子正在那里打篮球。
The youth of the country are being ignored by their leaders.
该国的青年没有受到领导人的重视。
The government calls on the youth to donate their blood voluntarily.
政府号召青年义务献血。
与 teenager 基本同义，但更加正式，强调尚不成熟。
An adolescent is often caught up in fantastic thoughts.
青少年常常耽于奇思异想。
His mental capacity never really got beyond that of an adolescent.
他的智力从未真正超过一个未成年人。
常为法律术语，强调未成年的人。
The number of juveniles arrested for violent crimes is increasing.
因暴力犯罪而被捕的少年犯人数在上升。
The number of juveniles in the general population has fallen.
总人口中青少年所占比例下降。
主要指 13 至 19 岁之间的青少年，强调该年龄段群体的自身特点。
Teenagers are vigorous.
青少年精力旺盛。
Their band is made up of three cool teenagers.
他们的乐队由3个帅气的少年组成。
I don't get pimples now, but I did when I was a teenager.
我现在不会长青春痘，但我在青春期时却没少长。
相关例句：
This juvenile offender received no more than a judicial slap on the wrist.
这名少年犯只被从轻处惩了一下。
Juvenile crime is increasing at a terrifying rate.
青少年犯罪正在以惊人的速度增长。
Juvenile offenders should not be tried in adult courts.
少年犯不应该在成人法庭受审。
Proposed monitoring sites for juvenile fish and shrimps.
建议的幼虾和鱼的监测地位置。
They queue orderly, steady pace, highlighting the juvenile's presence;
他们队列整齐、步伐稳健，彰显了少年的风采；
Psychologists are dealing with the problem of maladjusted adolescence and "juvenile delinquency".
心理学家对付着不适应环境的青少年和青少年犯罪的问题。