1.elliptical 椭圆形的；晦涩的
2.propagation 传播；繁殖
to spread an idea, belief etc to many people The group launched a website to propagate its ideas
if an animal, insect etc propagates itself or is propagated, it increases in number
3.refute 驳斥
She refuted any allegations of malpractice
4.hitherto 迄今
a species of fish hitherto unknown in the West
5.postulate 假设
to suggest that something might have happened or be true
It has been postulated that the condition is inherited
6.diagram 图表
a simple drawing or plan that shows exactly where something is, what something looks like, or how something works
7.velocity 速度
the speed of something that is moving in a particular direction the velocity of light
The speedboat reached a velocity of 120 mph.
a high velocity bullet
8.cesium 铯
a soft silver-white metal that is used in photoelectric cells. It is a chemical element symbol Cs
9.coordinate 坐标；协调
The agencies are working together to co-ordinate policy on food safety
10.patch 时期；补丁；一片
11.latitude 纬度
the distance north or south of the equator =the imaginary line around the middle of the world, measured in degrees
12.diagonal 斜的
a diagonal line is straight and joins two opposite corners of a flat shape, usually a square
13.radius 半径
the distance from the centre to the edge of a circle, or a line drawn from the centre to the edge
The shock of the explosion was felt over a radius of forty miles
14.geodesic 曲面结构的
having a shape or structure made from small flat pieces, usually triangles or pentagons, that are put together to form curves
15.elongated 加长的
The picture shows two elongated figures dancing
16.reconcile 调解，使一致
if you reconcile two ideas, situations, or facts, you find a way in which they can both be true or acceptable The possibility remains that the two theories may be reconciled.
reconcile something with something
Bevan tried to reconcile British socialism with a wider international vision.
be reconciled with somebody
to have a good relationship again with someone after you have quarrelled with them
Jonah and his youngest son were, on the surface at least, reconciled
reconcile somebody to something
to make someone able to accept a difficult or unpleasant situation
He tried to reconcile his father to the idea of the wedding.
reconcile yourself to something
Henry had more or less reconciled himself to Don's death
17.advent 出现；基督降临节
the advent of something
the time when something first begins to be widely used
18.mount 增加；组织，发起；安装；动物交配
19.space v.以一定间隔被排列
to arrange objects or events so that they have equal spaces or periods of time between them
They used three microphones spaced several yards apart
20.repel 使…恶心；相斥
