1
one-half of [noun]
后接名词短语，表示某物的二分之一。
He ate one-half of the pizza.
他吃了比萨饼的二分之一。
一半；二分之一
先理解核心含义，再看它在真实句子里的用法。
一半；二分之一
one of two equal parts; 1/2
He ate one-half of the pizza.
他吃了比萨饼的二分之一。
二分之一。
One of two equal parts (1/2, 1⁄2, 0.5).
The recipe requires one-half cup of sugar.
这个食谱需要二分之一杯糖。
One-half of the students passed the exam.
二分之一的学生通过了考试。
She divided the cake into two equal pieces and gave him one-half.
她把蛋糕分成两块相等的，给了他二分之一。
后接名词短语，表示某物的二分之一。
He ate one-half of the pizza.
他吃了比萨饼的二分之一。
用于度量单位前，相当于‘半’。
Add one-half teaspoon of salt.
加入二分之一茶匙盐。
The cost is one-half of the original price.
成本是原价的二分之一。
Not this
The recipe calls for one half cup of sugar.
Use this
The recipe calls for one-half cup of sugar.
当“one-half”作为复合形容词修饰名词时，应使用连字符连接，表示“二分之一的”。
Not this
I have one-half of the apples, and you have the other half.
Use this
I have half of the apples, and you have the other half.
在非修饰名词的独立使用中，表示“一半”通常直接用“half”即可，用“one-half”显得冗余且不自然。
Choose the next layer that will help you use one-half with more confidence.
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use one-half naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
通常用作单数，但逻辑上可数
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.