1
one half of [noun]
of 后面接被分割的整体。
One half of the students are from China.
一半的学生来自中国。
二分之一
先理解核心含义，再看它在真实句子里的用法。
二分之一
One half of the students are from China.
一半的学生来自中国。
Prepare the learner guide for this word
可生成：学习解释 Learner guide。只有点击后才会开始生成。
One half of the cake was chocolate, and the other half was vanilla.
蛋糕的二分之一是巧克力味的，另一半是香草味的。
The recipe calls for one half of a lemon.
这个食谱需要半个柠檬。
The discounted price is one half of the original price.
折扣价是原价的二分之一。
of 后面接被分割的整体。
One half of the students are from China.
一半的学生来自中国。
用于表示带分数。
The recipe calls for three and one half cups of flour.
食谱需要三杯半面粉。
直接修饰单位名词。
He ran one half mile in two minutes.
他两分钟跑了半英里。
Not this
I ate half one apple.
Use this
I ate one half of an apple.
中文说'一半'，但英语中分数表达是'one half'，语序不同；并且后接名词时需要加of。
Not this
I need one half cup of sugar.
Use this
I need one half of a cup of sugar.
分数'one half'修饰可数名词单数时，必须用of结构：'one half of a + 名词'，不能直接放在名词前。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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Dictionary facts from BridgeDict normalized sources.