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2021年2月23日发(作者：中秋节放假几天)

+

plus

加号；正号

-

minus

减号；负号

±

plus or minus

正负号

×

is multiplied by

乘号

÷

is divided by

除号

＝

is equal to

等于号

≠

is not equal to

不等于号

≡

is equivalent to

全等于号

≌

is equal to or approximately equal to

等于或约等于号

≈

is approximately equal to

约等于号

＜

is less than

小于号

＞

is more than

大于号

is not less than

不小于号

is not more than

不大于号

≤

is less than or equal to

小于或等于号

≥

is more than or equal to

大于或等于号

%

per cent

百分之

…

‰

per mill

千分之

…

∞

infinity

无限大号

∝

varies as

与

…

成比例

√

(square) root

平方根

∵

since; because

因为

∴

hence

所以

∷

equals, as (proportion)

等于，成比例

∠

angle

角

⌒

semicircle

半圆

⊙

circle

圆

○

circumference

圆周

π

pi

圆周率

△

triangle

三角形

⊥

perpendicular to

垂直于

∪

union of

并，合集

∩

intersection of

交，通集

∫

the integral of …

的积分

∑

(sigma) summation of

总和

°

degree

度

′

minute

分

″

second

秒

℃

Celsius system

摄氏度

{

open brace, open curly

左花括号

}

close brace, close curly

右花括号

(

open parenthesis, open paren

左圆括号

)

close parenthesis, close paren

右圆括号

() brackets/ parentheses

括号

[

open bracket

左方括号

]

close bracket

右方括号

[] square brackets

方括号

.

period, dot

句号，点

|

vertical bar, vertical virgule

竖线

& amp;

ampersand, and, reference, ref

和，引用

*

asterisk, multiply, star, pointer

星号，乘号，星，指针

/

slash, divide, oblique

斜线，斜杠，除号

//

slash-slash, comment

双斜线，注释符

#

pound

井号

backslash, sometimes escape

反斜线转义符，有时表示转义符或续行符

~

tilde

波浪符

.

full stop

句号

,

comma

逗号

:

colon

冒号

;

semicolon

分号

?

question mark

问号

!

exclamation mark (

英式英语

) exclamation point (

美式英语

)

'

apostrophe

撇号

-

hyphen

连字号

-- dash

破折号

...

dots/ ellipsis

省略号

single quotation marks

单引号

double quotation marks

双引号

‖ parallel

双线号

～

swung dash

代字号

§

section; division

分节号

→

arrow

箭号；参见号

1. Logic

9 there exists

8 for all

p ) q p implies q / if p, then q

p , q p if and only if q /p is equivalent to q / p and q are equivalent

2. Sets

x 2 A x belongs to A / x is an element (or a member) of A

x =2 A x does not belong to A / x is not an element (or a member) of A

A ?B A is contained in B / A is a subset of B

A ?B A contains B / B is a subset of A

A B

A cap B / A meet B / A intersection B

A [ B

A cup B / A join B / A union B

A n B A minus B / the di?rence between A and B

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