•An adult under British law is someone over 18 years old.根据英国法律规定，成年人是指18岁以上人士。

•Adults pay an admission charge but children get in free.成年人买票入内，儿童免费。

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•an adult male/elephant成年男子／大象

•She spent most of her adult life in prison.成年后，她大部分的岁月是在监狱中度过的。

•Let's try to be adult about this.在这件事上，我们不要耍小孩子脾气。