托福詞匯：英文標(biāo)點(diǎn)符號篇

　　+: plus 加號;正號

　　“1+1”讀作：one plus one

　　02

　　-: minus; negative 減號;負(fù)號

　　“2-1”讀作：two minus one

　　“-3”讀作：minus three或negative three

　　“2-(-3)”讀作：two minus negative three

　　03

　　±: plus-minus sign 正負(fù)號

　　“±1” 讀作：plus or minus one

　　04

　　×: multiplied by ; times 乘號

　　“2×3” 讀作：two multiplied by three 或 two times three

　　05

　　÷: divided by 除號

　　“4÷2”讀作：four divided by two

　　06

　　=: equals; is equal to 等于號

　　“1+1=2”讀作：One plus one equals two.

　　或 One plus one is equal to two.

　　07

　　≠: is not equal to 不等于號

　　“a≠b”讀作：a is not equal to b

　　08

　　≌: congruent to 全等(兩個(gè)圖形形狀相同、大小相等)

　　“△ABC≌△DEF”讀作：Triangle ABC is congruent to Triangle DEF.

　　09

　　≈: approximately equal to 約等于號

　　“3×3≈10” 讀作：Three multiplied by three is approximately equal to ten.

　　10

　　<: is less than 小于號

　　“1<2”讀作 One is less than two.

　　11

　　>: is greater than 大于號

　　“2>1”讀作：Two is greater than one.

　　12

　　≮: is not less than 不小于號

　　“3≮2”讀作：Three is not less than two.

　　13

　　≯: is not greater than 不大于號

　　“2≯4” 讀作：Two is not greater than four.

　　14

　　≤: is less than or equal to 小于或等于號

　　“2≤3”讀作：Two is less than or equal to three.

　　15

　　≥: is greater than or equal to 大于或等于號

　　“5≥4”讀作：Five is greater than or equal to four.

　　16

　　%: percent 百分之……

　　“10%”讀作：ten percent

　　17

　　‰ : per mill ; per thousand 千分之……

　　“10‰”讀作：ten per thousand

　　18

　　∞: infinity 無限大號

　　“-∞” 讀作：negative infinity

　　19

　　∝: varies as 與...成比例

　　“X∝Y”讀作：X varies as Y

　　20

　　√￣: square root 平方根

　　“√￣16=4”讀作：The square root of sixteen is four.

　　21

　　3√￣: cube root 立方根

　　“3√￣27=3”讀作：The cube root of 27 is 3.

　　22

　　∵: since; because 因?yàn)?/p>

　　“∵1+1=2”讀作：because one plus one equals two

　　23

　　∴: hence; therefore 所以

　　“∴1<2”讀作：hence one is less than two

　　24

　　∠: angle 角

　　“∠A”讀作：angle A

　　“∠A +∠B+∠C=180°”

　　讀作：The measure of angle A plus angle B plus angle C equals 180 degrees.

　　25

　　⌒: semicircle 半圓

　　“⌒AB”讀作：semicircle AB

　　26

　　⊙: circle 圓

　　“⊙A”讀作：circle A

　　27

　　○: circumference 圓周

　　“○=π×d”讀作：Pi multiplied by d equals circumference.

　　28

　　π: pi constant 圓周率

　　“π×d”讀作：pi multiplied by d

　　29

　　△: triangle 三角形

　　“△ABC”讀作：triangle ABC

　　What is the area of triangle ABC? 求三角形ABC的面積。

　　30

　　⊥: perpendicular to 垂直于

　　“A⊥B”讀作：A is perpendicular to B.

　　31

　　//: parallel to 平行于

　　Line AB is parallel to line CD.

　　32

　　∪: union of 并，合集

　　“A∪B”讀作：the union of A and B

　　33

　　∩: intersection of 交，通集

　　“A∩B”讀作：The intersection of A and B

　　34

　　∫: the integral of ……的積分

　　“∫x”讀作：the integral of x

　　35

　　∑: summation of 總和

　　“∑x”讀作：the summation of x

　　36

　　equation 方程式、等式

　　“y = kx” 讀作：

　　Y varies as x.

　　K is "the constant of variation.

　　y與x成正比(y是x的正比函數(shù))，k是常數(shù)。

　　“y = k/x”讀作：

　　Y varies inversely as x.

　　y與x成反比例(y是x的反比例函數(shù))。