But now it is realized that supplies of some of them are limited, and it is even possible to give a reasonable estimate of their

admin2014-10-27  40

问题 But now it is realized that supplies of some of them are limited, and it is even possible to give a reasonable estimate of their"expectation of life", the time it will take to exhaust all known sources and reserves of these materials.

选项

答案可是现在人们意识到,其中有些矿物质的蕴藏量是有限的,人们甚至还可以比较合理地估计出这些矿物质“预期寿命”,也就是说,经过若干年后,这些矿物的全部已知矿源和储量将消耗殆尽。

解析 全句为并列复合句。第一个it为形式主语,that引导着主语从句;第二个it也是形式主语代替后面的不定式;the time…是“expectation of life”的同位语,进一步解释其含义,而time后面的句子是它的定语从句。句子的层次较多,翻译时需要作必要的调整。
转载请注明原文地址:https://kaotiyun.com/show/g8K4777K
0

最新回复(0)