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。
He wrote a four at the top of the page.
他在页面顶部写了一个四。
数字4
The digit or figure 4; an occurrence thereof.
三加一的基数
the cardinal number that is the sum of three and one
长度为四个单位的物体
Anything measuring four units, as length.
面朝四点的纸牌、骨牌或骰子
a playing card or domino or die whose upward face shows four pips
You need to roll a four to start the game.
你需要掷出四点才能开始游戏。
Let's meet at four in the library.
我们四点钟在图书馆见面吧。
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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.