She is sixteen but has a mental age of five.

她十六岁，而智力年龄是五岁。

《牛津高阶英汉双解词典》

She is sixteen years old but has a mental age of five.

她十六岁,而智力年龄是五岁.

辞典例句

Sarah is almost forty but has a mental age of sixteen.

莎拉已经将近四十岁了,但是心理年龄还是16岁.

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How to find out the man's mental age in a moment?

如何在一瞬间看出男人的心理年龄?

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Person's biological age is young to age, but the person's mental age can be immortal.

人的生物年龄固然有年轻年老, 但人的心理年龄却可以长生不老.

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