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  3. 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

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

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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.
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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。
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