Becoming a father signified that he was now an adult.当了父亲意味着他现在是个成年人了。

Children under 14 must be accompanied by an adult.14岁以下的儿童必须由成年人陪同。

I have spent most of my adult life abroad.我成年后大部分时间在国外生活。

The play is definitely aimed at an adult audience.该剧的目标观众无疑是成年人。

Now you're 18, I expect you to show a more adult attitude.现在你18岁了, 我希望能你表现出更成熟的态度。

We were very adult about it. We discussed it rationally over a drink.在这件事上我们表现得很成熟。我们一边喝酒一边心平气和地谈了谈。

There is no adult reading matter in the shop, only children's books.店里没有成人读物, 只有儿童书籍。