"祖父"、"爷爷"、"外公"、"姥爷" 用英语都可以翻译为 "grandfather".
这个词来源于古英语 "grandsire", 由 "grand" (大的,重要的) 和 "sire" (父亲) 两部分组成.
例句:
My grandfather is a retired teacher. (我的祖父是一名退休的老师)
He is always eager to tell stories about his grandfather. (他总是渴望讲述关于他爷爷的故事)
My grandfather is a kind and wise old man. (我的祖父是一位善良且聪明的老人)
He is my mother's father, so he is my maternal grandfather. (他是我母亲的父亲,所以他是我的外公)