求翻译一下括号里面的内容

beiaidexin

82.(33511-!-item-!-188;#058&007598)



Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade.However, the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants) is unchanged at thirty-five dollars.

Which of the following, if true, does most to help explain why the increased cost-efficiency of solar power has not decreased its threshold of economic viability?

A. The cost of oil has fallen dramatically.

B. The reduction in the cost of solar-power equipment has occurred despite increased raw material costs for that equipment.

C. Technological changes have increased the efficiency of oil-fired power plants.

D. Most electricity is generated by coal-fired or nuclear, rather than oil-fired, power plants.

E. When the price of oil increases, reserves of oil not previously worth exploiting become economically viable.
求翻译一下括号里面的内容

cdwayne

為了讓太陽能發電比起火力更節省所要提高的油價

也就是說太陽能其實比油價還要貴的，除非油價提高(+$35)不然太陽能並不划算。

ashtreeliu

后面的new-fired power plant表面火力发电的成本也降了
前面说solar power的成本在近几十年也降下来了

但是solar和fired之间的差距还是35刀

答案很显然C，增加了oil-fired的利用率就是降低了油的成本，结果太能还是贵了

garlicwu

看了半天才搞明白这道题

题目的关键是对 threshold of economic iability 的定义，括号中意思是说要想太阳能电厂比油电厂效益高，每桶油的价格必须达到一个值，这也是为什么 threshold of economic liability用$35表示的原因，应该是指每桶油35块

举例说，太阳能电厂发100度电需要35块，油电厂发100度电需要一桶油，要想太阳能电厂效率高，每桶油价格就不能低于35块。这就是threshold，娘的，好晕呀

现在题目说太阳能电厂效率提高了，35块可以发120度电了，但是要想比油电厂效率高，每桶油还得35块，为什么？

油电厂说我效率也提高了，我现在一桶油可以发120度电了，靠，同样发120度电，你太阳能电厂凭什么比我效率高？所以太阳能电厂无赖了，妈的我要比你效率高，你每桶油就是不能低于35，这就是他娘的我的threshold

所以答案 C 出来了，我也晕死了