2012-10-07
oblique 倾斜
oblong 长方形的,矩形的；椭圆形的
obtuse angle 钝角
obtuse triangle 钝角三角形
octagon 八边形
octahedron 八面体
odd 奇数的
odd number 奇数
odometer 里程表
open curve 开曲线
open sentence 开句,开命题,真伪未定的命题
operation 运算
A process or action, such as addition, substitution, transposition, or differentiation, performed in a specified sequence and in accordance with specific rules.
operator 运算符
A symbol for expressing a mathematical operation.Such as +, -, ×,÷
order of operations 操作顺序
ordered pair 有序对
ordering 排序；分类
ordinal number 序数词
ordinate 纵坐标
origin 原点
orthocenter 垂心
ounce 盎司
outlier 离群值；异常值
oval 椭圆形
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