为何不信2013
hundred百、thousand千、ten thousand万、a hundred thousand十万、million百万、ten million千万、one hundred million亿、billion十亿
不同计数单位，按照一定顺序排列，它们所占位置叫做数位．在整数中的数位是从右往左，逐渐变大：第一位是个位，第二位是十位，第三位是百位，第四位是千位，第五位是万位，第六位是十万位，第七位是百万位，第八位是千万位，以此类推．同一个数字，由于所在数位不同，计数单位不同，所表示数值也就不同。 对于每一个数都应当有一个名称，以自然数来说，自然数是无限多的，如果每一个自然数都用一个独立的名称来读出它，这是非常不方便的，也是不可能做到的。为了解决这个问题，人们创造出一种计数制度，就是现在我们使用的十进制计数法。
一、数位含义
二、数位表
参考资料
数位.百度百科[引用时间2017-12-20]
向着好吃奔跑
英语中表示“许多”的词组很多，用法也不同。下面就由我为大家带来 英语 短语 集锦，大家生活中可以多用几遍，练一练语感。
表示数量
一、英语中表示“许多”的词组很多，按其用法可以分为以下三类
1、修饰可名词：many、a number of、 a few、many a、several等。many a 的意思相当于many , 但many a 后边接可数名词单数，如：
Many a student has such a question.许多同学有这样的疑问。
A number of students have passed the exam.许多学生都通过了考试。
Several days ago, I met him in the park.几天前我在公园里遇到了他。
2、修饰不可数名词：much、a great deal of、a large amount of等。
We can get a great deal of(a large amount of) information from internet.我们可以从互联网上获得大量信息。
3、既可修饰可数名词,也可修饰不可数名词：a lot of (lots of ); plenty of; a large quantity of 等。
Plenty of the water is polluted.许多水都被污染了。
Plenty of the rivers are polluted.许多河都被污染了。
二、few、little;a few、a little的用法：
1、few 和a few 都修饰可数名词。few意为“几乎没有”，表示否定;a few表示“有些、几个”，表示肯定;quite a few=many(修饰可数名词)表示“许多”。如：
I have eaten a few apples today.=I have eaten many apples today.
He has few friends.他几乎没有什么朋友。
2、little和a little都修饰不可数名词。little意为“几乎没有几个”，表示否定;a little表示“有些”。如：
I have little money.我几乎身无分文。
I have a little work to do.我有一些工作要做
quite a little=much(修饰不可数名词)表示“许多。
三、a number of 与the number of的区别：
a number of 相当于some，a few; a great/large number of相当于many，quite a few;the number of指的是“…的数量”。如：
The number of the students in our school is 5，000. 我们学校学生的数量是5000人。
A number of students have passed the exam.许多学生都通过了考试。
还有：
1.a good/great deal of+不可数 v单三
a large/small sum of money v单三
large/small sums of money v单三
a large/small amount of 不可数 v单三
large/small amounts of 不可数 v单三
2.a number of 名词复数 v复数
numbers of 名词复数 v复数
the number of 名词复数 v单三
a good/great many +名词复数 v单三
a good/great many of +the/these/those/one's+名词复数 v单三
3.a variety of 名词复数 /不可数名词 v单三
a supply of 名词复数 /不可数名词 v单三
a quantity of 名词复数 /不可数名词 v单三
a mass of 名词复数 /不可数名词 v单三
a measure of 名词复数 /不可数名词 v单三
measures of 名词复数 /不可数名词 v复数
masses of 名词复数 /不可数名词 v复数
supplies of 名词复数 /不可数名词 v复数
quantities of 名词复数 /不可数名词 v复数
varieties of 名词复数 /不可数名词 v复数
plenty of 名词复数 v复数
plenty of 不可数名词 v单三
表示程度的就很多了，一般形容词和副词都可以表示程度。
如：He is a good student!他是一个好学生(形容词表示程度的)
He listens to the teacher carefully!他认真的听老师上课!(副词表程度的)
表示数目增加
1) 增加了
A:
To increase by fifty people
To rise by eight hundred yuan
To increase / rise by thirty thousand kilograms
B:
To increase/ rise / be raised/ go up / shoot up by one percent
It’s an increase by fifty percent / one-half
To increase/ rise by four-fifths
2)增加到
A:
To increase/ rise to nine hundred person- times \
To increase/ rise to one thousand sets
To increase / rise to thirty hundred thousand meters
B:
To increase / rise to ten percent
To increase/ rise to three-fifths
3) 达到
A:
To come to five thousand tons
To reach ten thousand yuan
B:
To come to eighty percent
To jump to/ reach four-fifths
C:
As many as one million kilograms/ up to one million kilograms
As high as ninety-three meters /up to ninety-three meters
As long as/ up to seven thousand kilometers
D:
to amount to five thousand person-times
to add up to one hundred million yuan
to cover an area of totally nine million six hundred thousand square kilometers
表示百分比
1) Its output of cotton went up by 20 percent.
2) The price was reduced by 18 percent.
3) Its total output value increased by 11.5 percent over the previous year.
4) The total volume of state purchase in the first quarter rose by 5.2 percent, compared with the
same period of last year.
5) Its grain output was 16.5 percent higher than in/ than that of 1976.
6) The output value of chemical fertilizer in the first quarter was 18 percent above that of the
same period in 1975.
