learn的过去式写法,learn过去式有几种

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1. lighten [ˈlaɪtn]

vt./vi.减轻,变轻;照亮,变亮

to become less dark

参考例句:

1. The sky began to lighten after the storm. 暴风雨后天空开始放晴。

2. They decided to lighten taxes. 他们决定减轻税收。

2. estimate [ˈestɪmət]

n.估计,估量;评价,看法;vt.估计,估量

to guess the cost , size , value , etc . of something

参考例句:

1. We estimate the cost to be five thousand dollars. 我们估计费用为5000美元。

2. The lowest estimate would put the worth of the jewel at $200. 按最低的评估这块宝石也值200美元。

3. gap [gæp]

n.缺口;间隔;差距;不足,缺陷

an empty space or opening in the middle of something or between two things

参考例句:

1. We must see that there is no gap in our defence. 我们必须确保我们的防御没有漏洞。

2. There is a gap of five miles between towns. 镇与镇之间相隔五英里。

4. exhibit [ɪgˈzɪbɪt]

vt.展览,展出,陈列;n.展览品;陈列品

to show something publicly

参考例句:

1. Next week those goods will exhibit in that shop. 下个星期,这些货物将在那家商店展出。

2. The economy continued to exhibit signs of decline in September. 9月份,经济继续呈现出衰退的迹象。

5. doubtful [ˈdaʊtfl]

adj.难以预测的,未定的;怀疑的,可疑的

If you are doubtful about something, you are uncertain about it

参考例句:

1. Let's try to clear up our difficult and doubtful points. 让我们设法把难处和疑点解决一下。

2. Everyone was doubtful at first,but his statement in detail held up. 起初大家都怀疑,但他的详细叙述证明情况属实。

6. reveal [rɪˈvi:l]

vt.揭露,泄露;展现,显示

to make known or show something that is surprising or that was previously secret

参考例句:

1. The journalist did not want to reveal the identity of his informant. 那个新闻工作者不想透露消息提供人的身份。

2. Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。

7. shift [ʃɪft]

n.交换,变化,移动,接班者;vt.更替,移转,变声;vi.改变,定责,更衣

to ( cause something or someone to) move or change from one position or direction to another, especially slightly

参考例句:

1. Lend me a hand to shift this box, will you? 来帮一下忙,把这箱子搬开,好吗?

2. A sudden shift in the wind warned of the coming storm. 风向的突然改变预示暴风雨来临。

8. reflection [rɪˈflekʃn]

n.映象,倒影;反射;反映;非议;深思

the image of something in a mirror or on any reflective surface

参考例句:

1. The reflection of the sun on the glass wall was blinding. 玻璃墙上反射的太阳光令人目眩。

2. One can see the reflection of the tower in the water. 塔的影子倒映在水中。

9. render [ˈrendə(r)]

vt.给予;提供(帮助等);使得;使成为

to cause someone or something to be in a particular state

参考例句:

1. Any assistance you can render him will be appreciated. 无论给予他何种帮助,他都会非常感激。

2. We are going to render them economic assistance. 我们打算向他们提供经济援助。

10. continual [kənˈtɪnjuəl]

adj.不间断的,不停的;多次重复的,频频的

happening repeatedly , usually in an annoying or not convenient way

参考例句:

1. I am tired of this continual rain. 不停的下雨使我厌倦。

2. He has continual arguments with his father. 他屡次跟他父亲争论。

11. sufficient [səˈfɪʃnt]

adj.充足的,充分的

enough for a particular purpose

参考例句:

1. His income is sufficient for his needs. 他的收入能满足他的需要。

2. Have you had sufficient? 你吃饱了没有?

12. log [lɒg]

n.记录,圆木,日志;vt.伐木,切,航行;vi.伐木

a thick piece of tree trunk or branch , especially one cut for burning on a fire

参考例句:

1. They log for a living. 他们以伐木为生。

2. And then what do you do with that log? 然后你要拿那些记录做什么呢?

13. lens [lenz]

n.透镜,镜片;镜头

a curved piece of glass , plastic or other transparent material used in cameras , glasses and scientific equipment , which makes objects seem closer , larger , smaller ,

参考例句:

1. The lens of a camera forms images. 照相机的镜头使图像形成。

2. You should screen the lens of your camera from direct sunlight. 你应该保证相机的镜头不受到阳光的直接照射。

14. trace [treɪs]

n.痕迹,踪迹,微量;vt.追踪,找出根源,描绘;vi.追踪

to find someone or something that was lost

参考例句:

1. There isn't a trace of a smile on her face. 她脸上没有一丝笑容。

2. We have lost all trace of him. 我们找不到他的踪迹。

15. pinch [pɪntʃ]

n.捏,撮,困苦,偷窃;vt.掐,使...困苦,偷窃

to squeeze something, especially someone's skin , strongly between two hard things such as a finger and a thumb , usually causing pain

参考例句:

1. She would pinch on food in order to spend on clothing. 她过去常把伙食费省下来买衣服。

2. He put a pinch of salt on his food. 他在自己的食物上撒了一撮盐。

16. hay [heɪ]

n.(用作饲料或覆盖的)干草

grass which is cut , dried and used as animal food or as covering material

参考例句:

1. Cows feed on hay. 奶牛以干草为生。

2. They usually keep the hay in the barn. 他们通常将干草存放在谷仓中。

17. roughly [ˈrʌfli]

adv.概略地,粗糙地,粗鲁地

approximately

参考例句:

1. If you treat your coat so roughly, it will be worn out soon. 你如果这么糟蹋你的外套,它很快就不能穿了。

2. The island is roughly circular in shape. 这个岛屿大致是圆形的。

18. learned [ˈlɜ:nɪd]

adj.有学问的,博学的;learn的过去式和过去分词

describes someone who has studied for a long time and has a lot of knowledge

参考例句:

1. He went into a rage when he learned about it. 他听到这事后勃然大怒。

2. In this little village, he passed for a learned man. 在这个小村子里,他被视为有学问的人。

19. fraction [ˈfrækʃn]

n.小部分,碎片;一点,一些;分数

a number that results from dividing one whole number by another, or a small part of something

参考例句:

1. The car missed me by a fraction of an inch. 那车子差一点儿就要撞到我了。

2. The cost is only a fraction of his salary. 那项费用不过是他薪水的一小部分。

20. yield [ji:ld]

vt.生产,出产;让步,屈服;vi. 屈服,投降;n.产量,收获量

to supply or produce something positive such as a profit , an amount of food or information

参考例句:

1. A cow will yield several gallons of milk each day. 一头母牛每天产几加仑的牛奶。

2. We shall never yield to a conqueror. 我们永远不会向征服者低头。

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