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He worked in his twenties.

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He worked in his twenties.
in his twenties有什么道理?
He worked in his twenties.
in his twenties=在他二十多岁的时候
这是一段时期,不是二十岁,是二十岁左右,所以要加复数
in one’s 年龄的复数=在某人多少岁的时候
类似还有in his thirties 在他三十多岁的时候