adult
[ əˈdʌlt, ˈædʌlt]
adj.
成熟的;
（智力、思想、行为）成熟的;
成年人的;
成年的;
n.
成年的人或动物;
例句:
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The French songs are adult, sophisticated and clever.
来自BBC
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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。
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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？
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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。
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They also mostly spoke to me like an adult.
来自SA
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It takes hard work to behave like an adult.
来自NEWYORKER
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We should do our best to develop the adult education.
我们应当努力发展成人教育。
来自《权威词典》
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I like his adult approach to the problem.
我喜欢他老成地处理这个问题。
来自《权威词典》