单位符号的英文说法

单位符号的英语说法

1/2 = a (or one) half

1/3 = a (or one) third

1/4 = a quarter or one fouth

1/5 = a (or one) fifth

2/3 = two thirds

9/10 = nine tenths

53/4 = five and three quarters

15/64= fifteen over (or by) sixty-four

15% = fifteen per cent

4‰ = four per mill

R’ R prime

R” R double prime, R second prime

R1 R sub one

100°

C one hundred degrees Centigrade

+ plus; positive

- minus; negative

?

multiplied by; times

?

divided by

±

plus or minus

= is equal to; equals

?

is identically equal to

?

is approximately equal to

( ) round brackets; parentheses

[ ] square brackets

{ } braces

a

＞＞

b a is much greater than b

a?

b a is greater than or equal to b

a?

b a varies directly as b

lognX logX to the base n

the cubic root of x

the nth root of x

x2 x square, x squared, the square of x

Xn X to n factors; the nth power of x; x to the power n

x -8 x to the minus eighth power

?

x?

the absolute value of x

the mean value of X

the sum of the terms indicated; summation of

D x or d x the increment of x

dx differential x

dy/dx the first derivative of y with respect to x

ò

integral

?

infinity

1/2 a half; one half

2/3 two thirds

5/123 five over a hundred and twenty- three

eight and three over fourths; eight and three quarters

0.01 O point O one; zero point zero one; nought point nought one

6 % 6 percent

3‰ 3 per mille

2 : 3 the ratio of two to three

r=xd r equals x multiplied by d

5?

2=10 five times two equals ten

x3/8=y2 x raised to the third power divided by eight equals y squared

(a+b-c?

d)/e=f a plus b minus c multiplied by d, all divided by e equals f

y = (Wt-W)/x y equals W sub t minus W over x

符号的英文读法

．

period

句号

≈ is approximately equal to

约等于号

，

comma

逗号

＜

is less than

小于号

：

colon

冒号

＞

is more than

大于号

；

semicolon

分号

≮

is not less than

不小于号

！

exclamation

惊叹号

≯

is not more than

不大于号

？

question mark

问号

≤ is less than or equal to

小于或等于号

￣

hyphen

连字符

≥ is more than or equal to

大于或等于号

' apostrophe

省略号

；所有格符号

％

per cent

百分之

…

- dash

破折号

‰ per mill

千分之

…

' ' single quotation marks

单引号

∞ infinity

无限大号

double quotation marks

双引号

∝

varies as

与

…

成比例

( ) parentheses

圆括号

√ (square) root

平方根

[ ] square brackets

方括号

∵

since; because

因为

《

》

French quotes < /p>

法文引号

;

书名号

∴

hence

所以

... ellipsis

省略号

∷

equals, as (proportion)

等于，成比例

¨

tandem colon

双点号

∠

angle

角

ditto

双点号

?

semicircle

半圆

‖

parallel

双线号

?

circle

圆

／

virgule

斜线号

○

circumference

圆周

＆

ampersand = and

π pi

圆周率

～

swung dash

代字号

△

triangle

三角形

§

section; division

分节号

?

perpendicular to

垂直于

→

arrow

箭号；参见号

∪

union of

并，合集

＋

plus

加号；正号

∩

intersection of

交，通集

－

minus

减号；负号

∫ the integral of …

的积分

±

plus or minus

正负号

( ∑ sigma) summation of

总和

×

is multiplied by

乘号

°

degree

度

÷

is divided by

除号

′ minute

分

＝

is equal to

等于号

″ second

秒

≠ is not equal to

不等于号

＃

number …

号

≡

is equivalent to

全等于号

℃

Celsius system

摄氏度

≌

is equal to or approximately equal to

等于或约等于号

＠

at

单价

Pronunciation of Numerals

数词的读法

----------- -------------------------------------------------- ---------

als and Ordinals

基数和序数

(1)100

以内的数词

基数

序数

Roman Arabic

Numerals Numerals

罗马数字

阿拉伯数字

读法

数码

读法

I 1 one 1st the first

II 2 two 2nd the second

III 3 three 3rd the third

IV 4 four 4th the fourth

V 5 five 5th the fifth

VI 6 six 6th the sixth

VII 7 seven 7th the seventh

VIII 8 eight 8th the eighth

IX 9 nine 9th the ninth

X 10 ten 10th the tenth

XI 11 eleven 11th the eleventh

XII 12 twelve 12th the twelfth

XIII 13 thirteen 13th the thirteenth

XIV 14 fourteen 14th the fourteenth

XV 15 fifteen 15th the fifteenth

XVI 16 sixteen 16th the sixteenth

XVII 17 seventeen 17th the seventeenth

XVIII 18 eighteen 18th the eighteenth

XIX 19 nineteen 19th the nineteenth

XX 20 twenty 20th the twentieth

XXI 21 twenty-one 21st the twenty-first

XXV 25 twenty-five 25th the twenty-fifth

XXX 30 thirty 30th the thirtieth

XL 40 forty 40th the fortieth

L 50 fifty 50th the fiftieth

LX 60 sixty 60th the sixtieth

LXX 70 seventy 70th the seventieth

LXXX 80 eighty 80th the eightieth

XC 90 ninety 90th the ninetieth

IC 99 ninety-nine 99th the ninety-ninth

C 100 one hundred 100th the hundredth

CII 102 a hundred 102nd the (one) hundred

and two and second

246 two hundred and forty-six

751 seven hundred and fifty-one

(2)1000

以上的数词

1,000 = one thousand

一千

10,000 = ten thousand

一万

100,000 = one hundred thousand

十万

1,000,000 = one million

一百万

10,000,000 = ten million

一千万

100,000,000=one hundred million

一亿

( 3)

十亿以上的大数，英美有不同的读法：

英国

美国

十亿

one thousand million = one billion

百亿

ten thousand million = ten billion

千亿

one hundred thousand million = one hundred billion

万亿

one billion = one trillion

ons

分数

通常将分子读为基数，将分母读为序数。

1/2 = a (or one) half

1/3 = a (or one) third

1/4 = a quarter or one fouth

1/5 = a (or one) fifth

2/3 = two thirds

9/10 = nine tenths

53/4 = five and three quarters

15/64= fifteen over (or by) sixty-four

15% = fifteen per cent

4‰ = four per mill

ls

小数

0.4 = zero (or nought) point four

.01 = point (or decimal) nought one

12.34 = twelve point three four

567.809 = five hundred and sixty-seven point eight nought nine

30.45 = thirty point four five, five recurring

0.3% = decimal three percent

atic Forms

数学式