… 之一 (one of)

Showing friends the sights

• You are introducing China's great sights to visiting friends.
• the Great Wall长城cháng chéngis是shìworld世界shì jiè(bound form) up上shàngmost最zuìfamous有名yǒu míng(modifier / structural particle)的deto construct建筑jiàn zhùone of之一zhī yī。 — "The Great Wall is one of the most famous structures in the world."

… one of之一zhī yī = one of …

• (group) + one of之一zhī yī = "one of (the group)": cause原因yuán yīnone of之一zhī yī, best最好zuì hǎo(modifier / structural particle)的defriends朋友péng youone of之一zhī yī.
• The group comes first, with one of之一zhī yī at the end.

he他tāis是shìmy我wǒbest最好zuì hǎo的defriends朋友péng youone of之一zhī yī。

Reasons, problems, features

• weather天气tiān qìno good不好bù hǎois是shìcompetition (sports etc)比赛bǐ sàito cancel取消qǔ xiāo(modifier / structural particle)的decause原因yuán yīnone of之一zhī yī。 — "Bad weather was one of the reasons the match was cancelled."
• the panda熊猫xióng māois是shìChina's中国Zhōng guó(modifier / structural particle)的desymbols象征xiàng zhēngone of之一zhī yī。 — "The panda is one of China's symbols."

the panda熊猫xióng māois是shìChina's中国Zhōng guó的desymbols象征xiàng zhēngone of之一zhī yī。

one of之一zhī yī goes last

one of之一zhī yī and fractions

• (of — literary)之zhī also appears in fractions: one third三分之一sān fēn zhī yī = one third. In one of之一zhī yī alone, it means "one of".
• among them其中qí zhōngone of之一zhī yī = one of them: 这三zhè sān本书běn shū，among them其中qí zhōngone of之一zhī yīis是shìmy我wǒwritten写xiě(modifier / structural particle)的de.

among them其中qí zhōngone之一zhī yīis是shìby me我wǒwritten写xiě的de。

Recap

Read the full reference: HSK 4 grammar — Noun phrases.