注释：
1. if developed up to large scale production：如果开发达到大规模的程度。 if developed up to large scale production ＝ if (the key renewable energy sources were) developed up to large scale production
2.That land would be far better left alone：保留那一片土地远比使用它为好。(be) left alone 是“别动它”的意思。如：
Leave him alone. He can solve the problem himself.
(不要打搅他。他自己会解决问题的。)
3.Ausubel draws his conclusions by analysing the amount of energy renewables， natural gas and nuclear can produce in terms of power per square metre of land used：Ausubel 用每平方公尺土地与产生的能量的比率这一方法，对可再生能源、天然气和核电厂发出多少能量进行分析，从而得出他的结论。 (that) renewables， natural gas and nuclear can produce in terms of power per square metre of land used 是定语从句，修饰 the amount of energy， 关系动词 that 省略。in terms of 是 “按照，依据”。如：
We cannot measure everything in term of money.
(我们不能用金钱来衡量每一件事。)
4.this measure of efficiency：这种效率的值。measure 这里指“值的大小”。
5.We should be sparing land for nature：我们应该将土地留给自然。spare 是“免去，免遭”。如：
Call him and you will spare a visit.
(打个电话给他，省得自己跑一趟。)
6.the same "dual use" also applies to wind power：同样的“双重利用土地” 也适用于风力发电
7.The footprint for wind：风力发电占用的土地。footprint 在此的意思是“影响区”。wind 实际上指的是“风力发电”。
8.Farmers can still farm the land that the turbines are on：农民在涡轮机占用的土地上仍然可以耕种。 Farmers can still farm the land that the turbines are on ＝ Farmers can still farm the land on which the turbines are
9.I’m not sure I’d want to build one of these nuclear plants in Afghanistan：我确定不了我是否还想在阿富汗建立一个这样的核电厂。这是一种委婉的英语表达方式 (understatement)，其真正要表达的意思是：我不想在阿富汗建立一个这样的核电厂。
练习：
1.A) figures B) amounts C) numbers D) digits
2. A) small B) huge C) little D) vast
3. A) at B) over C) for D) against
4. A) expand B) minimize C) enlarge D) decrease
5. A) same B) similar C) alike D) identical
6. A) region B) site C) area D) land
7. A) leased B) cultivated C) used D) purchased
8. A) patch B) match C) catch D) fetch
9. A) in B) with C) of D) on
10. A) even if B) only if C) what if D) as if
11. A) lock up B) take up C) give up D) step up
12. A) towering B) interesting C) nicelooking D) existing
13. A) surrounds B) contains C) includes D) covers
14.A) issue B) stuff C) summary D) suggestion
15. A) doubtfully B) supposedly C) certainly D) honestly