four of + 复数名词
表示一个整体中的四个，后接复数名词或代词。
Four of the students were late.
学生中有四个人迟到了。
四点（钟）；四点牌；四点骰子；四岁的人；四单位长的东西；（板球）四分球
The number 4; the digit or figure 4.
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
四点整
Four o'clock.
四岁的人
A person who is four years old.
板球中击球手跑四次或击球触地后出界得四分
An event in which the batsmen run four times between the wickets or, more often, a batsman hits a ball which bounces on the ground before passing over a boundary, resulting in an award of 4 runs for the batting team. If the ball does not bounce before passing over the boundary, a six is awarded instead.
大前锋
A power forward.
四人单桨赛艇(可有舵手或无舵手)
Four-man sweep racing shell, with or without a coxswain.
He wrote a four at the top of the page.
他在页面顶部写了一个四。
用法提示：此处 four 作名词，指数字4或数字符号“4”。
You need to roll a four to start the game.
你需要掷出四点才能开始游戏。
用法提示：此处 four 作名词，指骰子朝上一面的四个点。
Let's meet at four in the library.
我们四点钟在图书馆见面吧。
用法提示：此处 four 作名词，指四点整（时间）。
表示一个整体中的四个，后接复数名词或代词。
Four of the students were late.
学生中有四个人迟到了。
表示四点整，后面可省略 o'clock。
The film starts at four.
电影四点开始。
作可数名词，指显示四点的纸牌或骰子，复数为 fours。
She drew a four from the deck.
她从牌堆里抽出一张四点牌。
表示年龄时可用 of four，指四岁的人。
Their daughter is a girl of four.
他们的女儿是个四岁的女孩。
grammar · medium
易错句子My little sister has four years old.
正确表达My little sister is four years old.
汉语说“有四岁”，但英语表示年龄要用 be 动词：主语 + is/are + 数字 + years old，不能用 have。
grammar · medium
易错句子We live on the four floor.
正确表达We live on the fourth floor.
表示楼层、次序等“第几”要用序数词 fourth，基数词 four 只表示数量“四”，不能用来表示顺序。
grammar · medium
易错句子This present is four you.
正确表达This present is for you.
表示“给、为了”的介词是 for；four 只是数字4。两者读音相同，但词性、拼写和意思都不同，不能混用。
四点整
The meeting starts at four o'clock.
会议在四点整开始。
四岁
My little brother is four years old.
我的小弟弟四岁了。
四叶草
She found a four-leaf clover in the field.
她在田野里找到了一片四叶草。
四轮驱动
This SUV has four-wheel drive.
这辆SUV是四轮驱动的。
四肢着地
The baby crawled on all fours.
婴儿四肢着地爬行。
四季
The four seasons are spring, summer, autumn, and winter.
四季是春、夏、秋、冬。
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