four

名词 four:

1. the cardinal number that is the sum of three and one
   同义词：4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quartet, quadruplet, foursome, Little Joe

形容词 four:

1. being one more than three
   同义词：4, iv

1. This street is four times shorter than that one.
   这条街道比那条短四倍。
2. There are four wheels in a car.
   一辆汽车有四只轮子。
3. He arranged his speech under four main heads.
   他把发言内容归纳成四个主要方面。
4. This line is four times as long as that one.
   这条线是那条线的四倍长。
5. Our cat has a litter of four kittens.
   我们家的猫一窝养了4只小猫。
6. After walking for four hours we were beginning to flag.
   步行了四个小时以后，我们开始累了。
7. Six minus two equals four.
   六减去二等于四。

four

n.（名词）
The cardinal number equal to 3 + .
四：一基数词，等于3加之和
The fourth in a set or sequence.
第四：一组或一列中的第四个
Something having four parts, units, or members, such as a musical quartet or a four-cylinder engine.
四个一组之物：四个（人或物）一组，如音乐四重奏，四缸发动机等

<习惯用语>all fours
All four limbs of an animal or person:
四肢：人或动物的四肢：
例句：
a baby crawling on all fours.
一个匍匐爬行的婴儿

来源：
Middle English
中古英语
from Old English fôower * see k wetwer-
源自 古英语 fôower *参见 k wetwer-

【引伸】
four
adj.（形容词）
pron.（代词）