我祖父尽管八十多岁了,仍然很活跃。

My grandfather is still active even though he is in his eighties.

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My grandfather is still active even though he is in his eighties.

in 在这里表示"处于某个年龄段范围内"。 his 是代词 he 的所有格形式,表示"他的"。 eighties 是名词 eighty(八十)的复数形式,表示"八十多岁"。 in his eighties 这个短语表示"在他八十多岁的年龄段",即"八十多岁"。

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