one-half 的音标为英 ['wʌnh'ɑ:f]、美 ['wʌnh'ɑf]，表示“二分之一”，指将一个整体平均分成两份后的其中一份。在实际使用中，它既可用作名词表示具体数量，也可作为形容词修饰名词，强调精确的比例关系。

用法示例

作名词：表示“一半的量或部分”。
Just under half of all marriages end in divorce.（几乎二分之一的婚姻以离婚收场）
Five over ten can be reduced to one over two.（十分之五可约分为二分之一）

作形容词：修饰名词，强调“一半的”。
Approximately one-half of this edition is new.（这一版本约有一半内容是新的）
One-half of the members of the Executive Committee shall constitute a quorum.（执行委员会半数成员构成法定人数）

常用短语搭配

one half：等同于 one-half，意为“一半”。
One half of the world's species live in rainforests.（全球一半物种生活在热带雨林中）

one half hour：表示“一个半小时”。

one half million：意为“150万”（即一百万的一半加上一百万，共150万）。

one half of：后接名词，表示“……的一半”。
One half of his money and his goods shall be given.（他的钱和财产的一半将被分配）

例句10句

大厅一次只能容下一半的出席者：Only one-half of the attendees could fit into the large hall at any one time.

相当于每人每天制造四点五英镑：That's about four and one half pounds for each person a day.

波阵面彼此间隔半个波长：Such wave fronts are separated from one another by one-half wavelength.

请先发运一半货物：Please try your best to ship one half of the goods as early as possible.

半数数值低于中位数：One half of its values will be found below and one half above the median.

每公升沸水加9.15毫升盐：Add nine-and-one-half milliliters of salt to each liter of boiled water.

项目年预算150万美元：Ms. Cosby provided the one-and-one-half-million-dollar yearly budget for the project.

生命中一半是运气：One-half of life is luck; the other half is discipline.

买一送一半价：*Buy one, get the secon