一、20个英文单词
1，focus
n.焦点，焦距，关注，中心，重点；v.集中，聚焦，给予某物关注
Make sure your subject is in focus before taking the photo.
2，general
adj.普遍的，总的，全面的，一般的，普通的，常规的，大致的；n.一般，将军
In general, trees are tall,green,and have brown bark.
3，fireman
n.消防队员，救火队员
Fireman risk their own lives to rescue others.
4，effort
n.努力，艰难的尝试，尽力，力气，精力，努力的成果
She makes efforts to do exercise so that she can keep fit.
5，warn
v.警告，告诫
The sign warned the bone about the danger of being eaten.
6，sore
adj.疼痛的，酸痛的，恼火的；n.疮，伤处
Ugh! My back feels so sore!
7，madam
n.夫人，女士
Madam, is there anything I can get for you?
8，opera
n.歌剧，歌剧团，歌剧院，戏剧
The woman is performing a wonderful opera on the stage.
9，spare
adj.备用的，多余的，闲置的，瘦的，空闲的；n.备用品；vt.抽出，腾出，免去，饶恕，节约，吝惜，省掉
Prepare a spare pen for your exam.
10，single
adj.未婚的，单身的，单个的，单人的；n.单程票，单曲唱片；v.拣出，挑选，作一垒手
He’s been single his entire life.He’s never even had a girlfriend.
11，ache
n.疼痛；v.疼痛，觉得疼痛，渴望
Mark had an ache in his back.
12，include
vt.包括，列入，包括，包含
Elephants, frogs and birds can be included in the category of “animals”.
13，while
conj.当...的时候，然而，虽然；prep.直至；n.一段时间；v.消磨
He snores while he sleeps.
14，influence
n.影响，势力，有影响的人或事；vt.影响
His mother was a main influence on his becoming a pianist.
15，energetic
adj.精力充沛的，充满活力的，有力的，积极的
These elementary school students are ver energetic.
16，yard
n.院，场地，码；v.把（家属）赶进栏里
What a large yard! We can have a barbecue.
17，event
n.活动（指演出、体育比赛、聚会等），事件，大事，社交活动
The university’s sports meeting is a popular event.
18，click
v.点击，（使）发出咔嗒声，情投意合，博得喝彩；n.点击，咔嗒声
He’s clicking the mouse.
19，enemy
n.敌人，敌国，敌军，危害物，敌对势力；adj.敌方的
The man who holds the pan is her last enemy.
20，honor
n.荣誉，荣耀，荣幸，光荣；vt.尊敬，使荣幸，对...表示敬意
She received an honor for her excellent academic performance.
二、几何重难点1
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