一、20个英文单词
1，characteristic
n.特点，特征，特色，品质；adj.典型的，独特的，特有的
The main characteristic of an elephant is its long trunk.
2，shame
n.羞愧，羞愧感，耻辱，遗憾，内疚，羞耻；vt.使羞愧，使蒙羞
He felt a deep sense of shame because he cheated in the exam.
3，local
adj.本地的，当地的，局域的，地方性的；n.当地人，地方，公共汽车，火车
The local people have their own clothing and culture.
4，government
n.政府，治理，政治
The offices of the local government are in this building.
5，shut
v.关上，闭上，停止，中止，防止进入；n.关闭；adj.关闭的，合拢的
Shut the door,please.
6，duty
n.责任，义务，值班，税
Everyone should carry out his duty conscientiously when at work.
7，master
n.大师，能手，主人，硕士，师傅，主宰；v.精通，掌握；adj.精通的，主要的
Practicing every morning makes him a master of kong fu.
8，gun
n.枪，炮；vt.枪击，打开节流阀；vi.用枪打猎
The man looks cool with a gun in his hand.
9，terrible
adj.非常严重的，糟糕的，病得很重的，心情很糟的，十足的，极度的，可拍的，骇人的
Thousands of eggs were broken in the terrible traffic accident.
10，cooperate
vi.合作，协作，配合
Baicizhan cooperated with a famous brand to co-brand these new T-shirts.
11，sand
n.沙滩，沙；v.用砂纸打磨，撒沙，以沙掩盖
The sand is so fine that it flows like fluid.
12，awake
adj.醒着的；v.(使)醒来，唤起，被唤起，(使)意识到
It's already 3:22 a.m,but she is still awake.
13，international
adj.国际的，世界的；n.国际比赛，参加国际运动或体育比赛的选手，外国人
All of them are international students from different countries.
14，victory
n.胜利，成功，克服
The father was pleased with his son's victory.
15，desert
n.荒漠，沙漠，应得的惩罚或奖励；vt.离弃，擅离职守；adj.荒凉的
I finally found water in the desert.
16，paragraph
n.(文章的)段，节，段落
Please summarize the main point of this paragraph.
17，continue
v.继续，持续
She continued running when the others stopped.
18，aloud
adv.大声地，出声地
The boy is wearing earphones and singing aloud.
19，impossible
adj.不可能的；n.不可能的事
It's almost impossible for her to push that massive rock.
20，bleed
v.流血，散开，榨取，敲诈，使流血；adj.[印]出血版的；n.出血
The claw of the dog is bleeding.
二、平面解析几何
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