Noun + 之一
之一 means "one of" and is placed after a noun to indicate that it belongs to a larger group. It is commonly used to single out a member from a category, such as 最好的之一 meaning "one of the best." The structure mirrors the English "one of" but appears at the end of the noun phrase.
北京是中国最大的城市之一。
běijīng shì zhōngguó zuìdà de chéngshì zhī yī.
Beijing is one of the largest cities in China.
她是我见过的最聪明的人之一。
tā shì wǒ jiàn guò de zuì cōngmíng de rén zhī yī.
She is one of the smartest people I've ever met.
这部电影是今年最受欢迎的作品之一。
zhè bù diànyǐng shì jīnnián zuì shòu huānyíng de zuòpǐn zhī yī.
This movie is one of the most popular works of the year.