成为一名父亲意味着他现在是一个成年人了。

Becoming a father signified that he was now an adult.

《柯林斯英汉双解大词典》

那是一个人在哭——不是一个成年人。

That is someone crying—isn't a grown-up person.

youdao

是一个成年人的度假胜地。

It's a holiday place for adults.

youdao

Because the pond is deep enough for an adult to wade into but too deep for a child to stand.

这个池塘不深，一个成年人足以趟过,然而小孩子却无法站立。

普林斯顿公开课 - 人性课程节选

How would you accomplish this kind of - how would you accomplish gene transfer in adult humans?

然而你怎样向,你怎样向一个成年人体内导入基因呢

耶鲁公开课 - 生物医学工程探索课程节选

So, we have no problem understanding a movie where somebody goes to sleep as a teenager and wakes up as Jennifer Garner, as an older person.

我们完全能够看懂电影中,一个少女睡去,一觉醒来却变成了詹妮弗·加纳,一个成年人

耶鲁公开课 - 心理学导论课程节选