另外，direction 作“指示，用法，说明”时常用复数形式。如：directions for use 用法说明，Full directions inside . 内附详细说明。
6. dozen 打；十二个
Pencils here are sold by the dozen . 这里的铅笔论打出售。
〖点拨〗dozens of 几十。当 dozen 的前面有数词时，dozen 最好用单数。如：I want two dozen eggs .
7. height 高；高度
The Party calls on us to climb the heights of science and technology . 党号召我们攀登科学技术高峰。
〖点拨〗in height 从高度上看。What’s the height of …? ……的高度是多少 ？如：The building is 40 metres in height . = The building is 40 metres high .= That’s a 40-meter-high building .
8. mention 提到；说起
Did you mention this to your parents ?
〖点拨〗As mentioned above .如上所述。Don’t mention it . (答复别人道谢时的用语) 不必客气。Not to mention = without mentioning 更不必说。
9. length 长；长度；一段
What’s the length of the Yellow River ?
〖点拨〗注意 length 的发音。in length 从长度上看。如：The road is 5,000 metres in length . a length of pipe 一节管子。It was said that this kind of medicine could increase the length of life .
10. attempt 试图；尝试
They attempted to raise money for a new building .
〖点拨〗attempt 不强调成功性，而try 暗示可能有成功性。attempt to do = try to do = do one’s best to do 尽力干…… 。make an attempt to do = make an attempt at doing 试图干……。
单元词组思维运用
1. get in 进去，进来；收进来；收庄稼
Please hold the car door open for the old lady while she gets in .
The farmers are busy in getting (in) the crops .
2. have got sth in 有某种活动；有……在进行
They have got a special exhibition on this month . 这个月他们要举办一个特别展览。
Have you anything important on this evening ?
高二英语第十四单元Satellites（卫星）由www.yf1234.com收集及整理,转载请说明出处www.yf1234.com
www.yf1234.com I’ve got nothing on tonight , shall we go to a cinema .
I’ve a meeting on tomorrow afternoon .
注意：on 为副词，该词组等于 have sth on , 还表示“穿着”的意思，但不用进行时，如：She had on her best red dress . 她穿着那件最漂亮的红色连衣裙。
3. do a study of = make a study of 研究
She has done a study of the danger of smoking .
I’m planning to do a special study of satellites next term .
4. send back (to) 发送（到），发回（到）；退货
What can satellites send back to the earth ?
They make a study of the information sent back to earth from weather satellites .
You can send back the computer back to the shop if you are not satisfied .
5. in space在太空，在宇宙空间
A satellite travels in an orbit round another object in space .
I hope I’ll be able to walk in space some day .
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高二英语第十四单元Satellites（卫星）