Grammar Note
作定语时后接复数可数名词，如 twenty books。
二十
先理解核心含义，再看它在真实句子里的用法。
二十
twenty
There are twenty students in our English class.
我们英语班有二十名学生。
指二十个物品或单位的数量
denoting a quantity consisting of 20 items or units
She bought twenty apples at the market.
她在市场买了二十个苹果。
The meeting lasted twenty minutes.
会议持续了二十分钟。
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作定语时后接复数可数名词，如 twenty books。
Collins 词频等级为 5，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.