grandpa是一個英語名詞，它的含義是爺爺，外公。grandpa屬于可數名詞，grandpa的復數形式是grandpas。
例句：
Grandpa is not feeling very well today.
爺爺今天身體欠安。
When Grandpa shows his authority, we are all afraid of him.
爺爺一發威，全家人都害怕。
We fell about at grandpa's funny story.
聽了爺爺講的滑稽故事，我們忍不住大笑。
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