成年人的英文：
adult

参考例句：

The major was very studious of his appearance.
成年人十分注意自己的外表。

It meant the phylogenetic and ontogenetic development of human adult behaviour
它意指成年人行为的系统发育与个体发育的发展。

Why were grown-ups always so stuffy and slow to recognize good ideas?
为什么成年人总是那么一本正经，对好点子反应那么迟缓呢？

[ Administration and dosage]Adults: 1 tablet, 3 4 times daily.
[服法与剂量]成年人:每次l片,1日3～4次。

I'm already a major.
我已经是个成年人了。

Mature subject matter.
成年人考虑的问题

The attitude of grownups has changed.
成年人的态度已有了转变。

Many adults also have some acne easily.
成年人也很容易得痤疮。

Children pick up foreign languages easier than adults.
孩子们学外语比成年人容易。

Grown-ups often look back to the old days.
成年人常常回想过去的日子。

adult是什么意思：
adj. 成熟的；成年的
n. 成年的人或动物

These films are suitable for adults only.
这些电影只适宜成人观看。

Children unaccompanied by an adult will not be admitted.
儿童无成人带领不得入内.

The bear was a fully grown adult.
那只熊已完全发育成熟。

In the eyes of the law you are not an adult.
从法律的角度看你还没有成年。

Meeting adults embarrassed the shy child.
和家长见面使得这个害羞的孩子很尴尬。