12 + noun
直接修饰名词表示数量。
I have 12 apples.
我有12个苹果。
表示由12个项目或单位组成的数量
表示由12个项目或单位组成的数量
denoting a quantity consisting of 12 items or units
She bought 12 apples at the market.
她在市场买了12个苹果。
用法提示：这里“12”作形容词修饰“apples”，表示十二个苹果。
The class has 12 students this year.
今年这个班有12名学生。
用法提示：这里“12”作形容词修饰“students”，表示十二名学生。
He ran 12 kilometers this morning.
他今天早上跑了12公里。
用法提示：这里“12”作形容词修饰“kilometers”，表示十二公里。
直接修饰名词表示数量。
I have 12 apples.
我有12个苹果。
定冠词 the 表示特指这12个。
The 12 students passed the exam.
那12个学生通过了考试。
表示年龄。
She is 12 years old.
她12岁。
表示百分比。
12 percent of respondents agreed.
12%的受访者同意。
grammar · medium
易错句子There are 12th students in the class.
正确表达There are 12 students in the class.
中文学习者常混淆序数词和基数词；描述数量时应用基数词（如 12），而非序数词（如 12th）。
grammar · medium
易错句子He came in twelve place.
正确表达He came in twelfth place.
中文在表示排名时有时直接使用基数词，但英语中表示顺序必须用序数词（如 twelfth）。
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