一、20个英文单词
1，nod
v.点头，打盹；n.点头，瞌睡，打盹，粗心大意
To nod in agreement,lean your head forward a little.
2，congratulation
n.祝贺，祝贺信，恭喜
He received many congratulations for his excellent work.
3，honest
adj.诚实的，坦率的，可靠的，正直的
Before giving testimony,the witness has to pledge herself to being honest.
4，similar
adj.相似的，类似的；n.相似的人或事物，相像的人，相似物
These two girls are very similar.
5，main
adj.主要的，最重要的；n.输电干线，总管道
The main stream of this river leads to the sea.
6，describe
v.描述，形容
She described her missing child to a passer-by.
7，junior
n.(中学或大学的)三年级学生，职位较低者；adj.年少的，下级的，低下的，低年级的
"Junior" means young or younger children.
8，shock
v.使...震惊，使...震动，震惊，使难以相信，使触电，使遭电击；n.震惊，震动，休克，令人震惊的事，电击，触电
My cat was totally shocked by the big surprise!
9，neither
pron.两者都不；conj.也不，既不；adj.两者都不的；adv.两个都不，既不...也不...
He tasted both dishes and decided neither was delicious.
10，support
n.支持，支援，支撑物，支持者，资助，赞同，安慰，证实；v.支援，支撑，拥护，资助，赞同
My father gives me a lot of love and support.
11，reduce
v.减少，减小，降低，精简，缩小
The price of this phone is reduced to ￥998 in the sale.
12，certain
adj.有把握的，确定的，某个，特定的，某一，某些，肯定的，必然的；pron.某些，某几个
The girl is certain about her answer.
13，moment
n.瞬间，片刻，时刻
The girl is using her phone to capture the moment.
14，electric
adj.电的，带电的，电动的，刺激的，用电的；n.供电
Don't touch these electric wires.It's dangerous.
15，imagine
v.想象，幻想，设想，猜想，认为
The lady imagines herself dancing with a prince.
16，apartment
n.<美>公寓，一套住房，公寓套房
We have rented an apartment,time to buy some furniture.
17，stress
n.压力，强调，重读，重音，紧迫，节拍，紧张，应力；v.强调，重读，加压力于，使紧张
After working such a whole day,he feels a lot of stress.
18，force
v.强迫，推动，凭借武力前进，促使，迫使；n.力量，武力，势力，有势力的人，军队，部队，影响力
The child is being forced to have breakfast.
19，rather
adv.有点儿，相当，更确切地讲；conj.而不是
I would rather eat an apple than a donut,It's healthier!
20，explore
v.探险，探索，摸索，探讨，研究，勘察，考察
They will explore the dark cave.
二、平面解析几何模型精讲
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