The correct spelling is "a branch". In Chinese, "zhi" and "zhi" have different meanings. "Branch" is often used to indicate a branch, faction or river basin. When it is used to describe quantity, it only applies to rod-shaped objects, such as pens or pencils. "Branch" refers to the branch of a tree trunk or a plant. When describing the small branches of a tree, you can use "one branch" or "two branches".