❶ 关于化学等式符号的读法
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
≤ is less than or equal to 小于或等于号
≥ 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 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
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 B
≮ is not less than 不小于号
！ exclamation 惊叹号
≯ is not more than 不大于号
？ question mark 问号
Mathematic Forms 数学式
(1) Addition 加法
1+2=3 One and two are three.
2+3=5 Two plus three equals five.
4+0=4 Four and nought is equal to four.
45+70+152=267 45,70 and 152 added are (or make) 267
the sum (or total) is 267.
(2)Subtraction 减法
9-4=5 Nine minus four equals (or is equal to) five.
15-7=8 Seven from fifteen leaves eight.
23,654-8,175=15,479 8,175 (take or subtracted) from 23,654 leaves 15,479. The difference
(or The remainder) is 15,479.
Nine from five won`t go