一、20个英文单词
1，plot
n.情节，布局，阴谋，小块土地；v.密谋，制定，为小说写情节，绘图，计划，标示位置
This story has a romantic plot.
2，keen
adj.热衷的，渴望的，敏锐的，强烈的，着迷的；v.恸哭；n.(英)号哭，恸哭；adv.如饥似渴地
The little boy is always very keen on helping others.
3，finite
adj.有限的，限定的
The set is finite in size,since it only has four numbers.
4，signature
n.签名，署名，识别标志，鲜明特色，个人特色；adj.标志性的，惯有的
The boss worte his signature at the document.
5，invoke
v.调用，祈求，恳求，引起
People invoke God when they're in trouble.
6，system
n.系统，体系，身体，制度，体制，方法
There are eight planets in our solar system.
7，whistle
n.口哨（声），汽笛声，警笛声；v.吹口哨，呼啸
The reference blew the whistle to stop the game.
8，shabby
adj.破烂的，卑鄙的，（人）衣衫褴褛的
Our plan was to buy and fix the shabby old house.
9，conquest
n.征服，战胜，战利品，爱情的俘虏
Mike made a conquest of his enemy in the boxing fight.
10，deviate
v.偏离，背离；adj.脱离常规的；n.脱离常规的人
The hiker has deviated from the main route;let's hope he can reach his destination.
11，function
v.工作，运转，起作用；n.功能，作用，用途，机能，函数，职务，职责
She is checking whether the machine functions normally.
12，scientific
adj.科学的
Be very careful when doing scientific experiments.
13，continual
adj.不断的，连续的，频繁的
The water in the river is continually flowing.
14，distract
vt.使分心，打扰
The wife tried to distract her husband by asking him to look at her phone.
15，variable
adj.易变的，可变的；n.变量，可变物
Chameleons have a feature where the color of its body is variable.
16，thoughtful
adj.体贴的，沉思的，缜密思考过的，深思熟虑的
Her boyfriend is very thoughtful.
17，streamline
vt.使成流线型，使...简化，使合理化；n.流线型；adj.流线型的
The design of the car has been streamlined,so it can go even faster.
18，oppress
vt.压迫，使（心情）折磨，使烦恼，虐待，欺辱，使（心情等）沉重，使烦恼
The poor employees are oppressed by their cruel boss.
19，automation
n.自动化
Automation raises the unemployment rate in manual factories.
20，upgrade
v.升级，提高；n.改善，提高，升级，升舱
Press this button to upgrade in one click.
二、重难点
