"familiar" 的延伸詞有：
- familiarity：名詞形式，表示熟悉、親近的程度，也可以指親密關系。
- familiarize：動詞形式，表示使熟悉，使習慣於。
以下是幾個例句：
- His familiarity with the city made him a valuable guide to tourists.
他對這座城市的熟悉程度使他成為遊客的寶貴向導。
- I need to familiarize myself with this new software before I can start using it.
在我開始使用這個新軟件之前，我需要熟悉它。
- The two of them had an easy familiarity, as if they had known each other for years
這兩個人相處得很自然，好像認識了好幾年壹樣。