9[jiu]，是8与10之间的自然数，是一个正整数，是奇数和合数。9是一个简单的阿拉伯数字。9是3的二次方，也可以说是3的平方，它是平方数，也是一个有理数。

9用英文怎么写？

Nine

英 [naɪn]  美 [naɪn]

num.九

复数： nines

nine的双语例句

1.Nine out of ten families are gone. 

十停儿人家去了九停儿。

2.Most marriages fail after between five and nine years. Nevertheless, people continue to get married. 

大部分婚姻在婚后第五至第九年间失败，然而，人们仍会选择结婚。

3.The award for the oratorical contest was made by a jury of nine professors. 

演讲比赛的裁决由九位教授组成的评判委员会作出。

4.Three times three is nine. 

三三得九。

5.Tests were carried out by teachers on the entire cohort of eight to nine year-olds in their third year at primary school 

测试是由老师在小学三年级所有八岁到九岁的学生中进行的。

nine的常见句型

用作数词 (num.)

1.I'll leave for Shanghai at nine.

九点钟，我将赴上海。

2.I have nine dolls in the bedroom.

我的卧室里有九个布娃娃。

nine的词汇搭配

on cloud nine 狂喜 

nine tenths 十分之九

a nine days' wonder 轰动一时即被遗忘的人

nine to five 朝九晚五 

cloud nine [俚]极乐心境

A stitch in time saves nine. 小洞不补大洞吃苦

nine pins 九柱滚球戏 

nine needles 九针 

nine count 数到九 

nine edge 九边 

nine orifices 九窍 

nine nines 九个"9" 

ninety-nine times out of a hundred 几乎每次 

cat-o'-nine-tails 九尾鞭 

nine day's wonder 轰动一时的人

nine times out of ten 十有八九 

the nine 九个文艺女神

ninety-nine out of a hundred 百分之九十九

the nightmare and her nine-fold 梦魇及其九子女

a cat with nine lives 富有生命力的人

nine的真题例句

1.That’s the conclusion of a recently released study, which analysed 259 bottles from 11 brands sold in nine countries, revealing an average of 325 plastic particles per litre of water.

2019年12月四级真题（第二套）阅读 Section A

2.The sea slugs are so good at gathering energy from the sun that they can live up to nine months without having to eat any food.

2019年12月四级真题（第三套）阅读 Section C

3.Looking back now, nine years later, I can't remember exactly what it was about these universities that made them seem so much better.

2018年6月六级真题（第三套）阅读 Section B

4.nine decades ago, leading economists predicted that technological advances and rising productivity would mean that would be working a 15-hour week.

2019年12月六级真题（第二套）听力 Section C

5.I had an early start at the age of nine with a role in a 1990s TV series, but it wasn't until I finished film studies that I pursued my career as an actress.

2017年高考英语天津卷 阅读表达 原文

6.If the self-centred guest arrives late, the nine others at the table set for ten will have to wait.

2015年高考英语陕西卷 阅读理解 阅读B 原文

7.But the regular time it takes to get a doctoral degree in the humanities is nine years.

出自-2011年考研阅读原文