tree 树 n
node 结点 n
binary tree 二叉树 n
subtree 子树 n
root 根 n
degree of a node 一结点的度
degree of a tree 一棵树的度
leaf(leaves) 叶子 n
terminal node 终端结点 n
parent node 双亲结点,父结点 n
child node 子节点 n
level 层 n
depth, height 深度,高度 n
full binary tree 满二叉树 n
complete binary tree 完全二叉树 n

approximate 近似v，近似的adj
approximately 近似地 adv
approximation 近似，近似值 N
sum 和 n
difference 差 n
product 积 n
quotient 商 n
reminder 余数 n
power 乘方，幂 n
root 根 n
prime number 质数，素数 n
composite number 合数 n
ratio 比，率 n
decimal 十进制，小数 n
fraction 分数 n
formula 方程式，公式（plur. fomulae）
Simultaneous Equation 方程组 n
discrete 离散的 adj
continuous 连续的 adj

axis（axes） 坐标轴 n
plane 平面 n
perpendicular 垂直，垂直的 adj，n
horizontal   水平的 adj
vertical 垂直的 adj
satisfy 使满足，使符合 v
rectangular 矩形的，直角的 adj
rectangular coordnate system 直角坐标系
intersect 相交 v
intersection 交点，交集，逻辑与 n

phase 相位
period   周期
frequency 频率
vibration amplitude 振幅
initia

calculus 微积分
linear 线性
linear algebra 线性代数
coordinate 坐标
linear coordinate system 线性坐标系
absolute value   绝对值
inequality 不等式，不等量（名词 N.）
equality    等量，平等（N.）
equation   等式，方程（N.）
correspond   对应 V.
origin   原点(坐标系) N.
finite 有限的 adj
interval 区间 N
open interval 开区间 (a,b)
closed interval 闭区间 [a,b]

Raise and Rise
That boy always raises his hand when I ask a question. 举手
That shelf was too low so we raised it a few inches.   抬高
Heavy rains have raised the level of the river this year. 使水位上升

I always rise at 6 o'clock. 起床
After the concert, everybody rose and clapped. 起立
The sun has just risen.   升起

spring n. 弹簧
mattress n. 床垫
gust n. 一阵风
promptly adv. 迅速的
excursion n. 远足
reward n. 报偿 v. 奖赏
virtue   n.   美德
diet   n. 节食
embarrass   v. 使尴尬
guiltily adv. 内疚地

join simple statement together to make complex statement
He missed the train because he did not hurry.
Although he ran fast,he failed to win the race.
I was so tired that I went to bed immediately.

when,until,after,as soon as,while,before,as,since,to,in order to,although,who,which and that....

Things always happen.
This box conta

FOR
account
His illness accounts for his absence. 解释
ask
Might I ask for a photograph of your little daughter? 请求
act(for or on)
As the chairman is ill, I'm asking Mr. Sharp to act for him. 代表
This medicine acts on the heart. 对...起作用
ap

TO
accustom(ed)
He had to accustom himself to the cold weather. 习惯于
appeal
Let us appeal to the President to aid us. 呼吁
apply(to or