1
one-third of [noun phrase]
表示整体的一部分，后接名词短语。
one-third of the cake
蛋糕的三分之一
三分之一
先理解核心含义，再看它在真实句子里的用法。
三分之一
one of three equal parts of a divisible whole
one-third of the cake
蛋糕的三分之一
相关中文义项：三分之一
one of three equal parts of a divisible whole
One-third of the students passed the exam.
三分之一的学生通过了考试。
The recipe calls for one-third of a cup of sugar.
食谱要求加三分之一杯糖。
He only finished one-third of his homework.
他只完成了作业的三分之一。
表示整体的一部分，后接名词短语。
one-third of the cake
蛋糕的三分之一
与动词搭配，表示变化的幅度。
the price increased by one-third
价格增加了三分之一
用作定语修饰名词，常见于分数表达。
a one-third discount
三分之一折扣
Not this
He ate one third of the pie.
Use this
He ate one-third of the pie.
在英语中，当“one-third”作为名词使用时，通常需要用连字符连接“one”和“third”，表示一个整体单位。缺少连字符可能导致阅读歧义，尽管在非正式场合可能被接受，但标准书面英语中应使用连字符。
Not this
The recipe calls for one-thirds of a cup.
Use this
The recipe calls for one-third of a cup.
“one-third”本身已是单数形式，表示“三分之一”。在英语中，分数中的分子为1时，分母始终使用单数形式，因此不能加-s变为“one-thirds”。正确的表达是“one-third”，复数形式仅用于分子大于1时，如“two-thirds”。
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分数作名词时通常可数，如 one-third、two-thirds。
Dictionary facts from ECDICT, WORDNET.