+ 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 less than 小于号
is greater 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
root 根
∵ since; because 因为
hence 所以
∷ equals; as 等于;成比例
= 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
angle 角
⌒ semicircle 半圆
⊙ circle 圆
○ circumference 圆周
pi 圆周率
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