enumerate
vt.枚举；计数(count, numberate)
Sam can enumerate all the Presidents of the United States.
山姆可以列举出所有的美国总统。
calculate
vt.计算（count），估计；计划
Children calculate with the help of their fingers when they are learing counting.
孩子们在学习算术时要借助手指计算
clalculus
n.微积分学
percentage
n.百分数，百分率，百分比
The percentage of unskilled workers is small.
技术不熟练的工人占得比例很小。
proportion
n.比例；均衡；面积；部分
We do not always find visible happiness in proportion to visible virtue.
我们发现，可见的幸福与可见的美德不一定成比例。
exponent
n.指数(index)
derivative
n.导数
The limiting value of the ratio of the change in a function to the corresponding change in its independent variable is called derivative.
一个等式中，自变量变化量与因变量变化量的比值的极限叫做导数。
power
n.乘方；幂
arc
n.弧，弓，拱
infinity
n.无限，无穷大