Usage priority
Collins 词频等级为 5，建议结合例句记忆，而不是只背中文释义。
四
先理解核心含义，再看它在真实句子里的用法。
四
the number 4; one more than three; two plus two
There are four apples on the table.
桌子上有四个苹果。
数值4；介于3和5之间；2加2；四个点 (••••)
A numerical value equal to 4; the number after three and before five; two plus two. This many dots (••••)
描述有四个元素的集合或组
Describing a set or group with four elements.
She has been learning English for four years.
她已经学了四年英语。
We need four more chairs for the meeting.
我们还需要四把椅子来开会。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
Use four naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
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.