名词
中文翻译：父亲的父亲
同义词：
['grandfather', 'great-grandfather']
例句：
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1. My grandfather passed away last year.
我的祖父去年去世了。
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2. He has two children, one of whom is my father's son.
他有两个孩子，其中一个是我的父亲的孙子。
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3. The old man was a great grandfather to the family.
那位老人是这个家庭的曾祖父。