之一 is one of those grammar that really gives your Chinese some polish. Using with confidence makes your Chinese sound great! Learn how to use it properly in this article.

Structure
In order to express "one of the..." in Chinese, "之一" (zhī yī) can be used at the end of the sentence.
Adjective + Noun + 之一
An important note to keep in mind is that 之一 can only follow a noun.
Examples

Tā shì wǒ de hǎo pénɡyou zhī yī 。
她 是 我 的 好 朋友 之 一 。
She is one of my best friends.

Duì wǒ lái shuō,niǔyuē shì shìjiè shànɡ zuì hǎo de chénɡshì zhī yī .
对 我 来 说,纽约 是 世界 上 最 好 的 城市 之 一 。
According to me, New York is the one of the best cities in the world.

Tā juédé bǎishìkělè shì zuì hǎo hē de qìshuǐ zhī yī 。
他 觉得 百事可乐 是 最 好 喝 的 汽水 之 一 。
He thinks Pepsi is one of the best tasting sodas.