four + plural noun
four 后直接接可数名词复数，表示数量，名词一般不用单数形式。
There are four chairs around the table.
桌子周围有四把椅子。
四个；数值4；介于3和5之间；2加2；四个点 (••••)；描述有四个元素的集合或组；四个；[机] 四冲程循环
the number 4; one more than three; two plus two
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.
There are four apples on the table.
桌子上有四个苹果。
用法提示：数词“four”直接修饰名词，表示数量四。
She has been learning English for four years.
她已经学了四年英语。
用法提示：数词“four”位于“years”前，表示时间长度为四年。
We need four more chairs for the meeting.
我们还需要四把椅子来开会。
用法提示：数词“four”与“more”连用，表示在原有基础上再增加四个。
four 后直接接可数名词复数，表示数量，名词一般不用单数形式。
There are four chairs around the table.
桌子周围有四把椅子。
表示某个特定群体中的四个时，用 four of + 限定词（the、these、my 等）+ 复数名词。
Four of the students were late.
学生中有四个人迟到了。
in fours 表示每四个一组，常用于排列或分组。
The dancers lined up in fours.
舞者们每四人一组排好队。
grammar · medium
易错句子There are four apple on the table.
正确表达There are four apples on the table.
英语中数词 four 后面的可数名词必须用复数形式，所以 apple 要变成 apples。汉语名词没有单复数变化（“四个苹果”），因此中国学习者容易漏掉这个复数词尾 -s。
grammar · medium
易错句子She lives on the four floor.
正确表达She lives on the fourth floor.
表示顺序、名次或“第几”时要用序数词 fourth，不能用基数词 four。汉语的“四楼”“第四”都用同一个“四”，所以学习者容易直接译成 four；纠正时只需把基数词换成序数词 fourth。
grammar · medium
易错句子He is a four years old boy.
正确表达He is a four-year-old boy.
数词与名词、形容词连用作前置定语时，要构成带连字符的复合形容词 four-year-old，其中的名词 year 用单数。汉语“四岁的男孩”没有这种形式变化，学习者常按汉语逐词写成 four years old。
四点（钟）
Let's meet at four o'clock.
我们四点见吧。
四岁
My daughter is four years old.
我女儿四岁了。
四肢着地；匍匐
The baby crawled on all fours.
宝宝四肢着地爬行。
四轮驱动
This car has four-wheel drive.
这辆车是四轮驱动的。
四叶草
She found a four-leaf clover in the grass.
她在草丛里找到一株四叶草。
四星级酒店
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Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.
We stayed at a four-star hotel.
我们住在一家四星级酒店。