前缀ad-, 去，往。词根ol, 成长. -t,过去分词后缀。

1. I tried to understand the adult world and could not.

我试着去了解成人世界，却无法猜透。

2. Which adult in these children's lives will provide the nurturing they need?

这些孩子生活中的哪个成人会为他们提供所需的养育呢？

3. His adult life mirrored the downward course of his father's life.

他成年后的生活反映出了他父亲的生活在走下坡路。

4. As an adult, you can assess the situation realistically.

作为一个成年人，你能现实地评估局势。

5. The average adult man burns 1,500 to 2,000 calories per day.

普通成年男子每天消耗的热量为1,500到2,000卡路里。