Although much was known previously about the chemical properties of aluminum and their application to practical uses, (94) it was not until sixty years ago that a method of extracting aluminum ore was found which could lead to a cheap large-scale process.
(95) In the past few decades men behaved as if their supplies of minerals were inexhaustible. (96) 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.
But in the case of minerals it is especially difficult to give a reliable estimate of reserves because surveys have not been completed and it is not certain that all sources are known. Uranium provides a good example of this fact.
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答案解析
Section VII: Chinese-English Translation (15 points)
76. The wish of fully utilizing the natural resources for the benefit of mankind will eventually come true.
77. To my knowledge, this is the best program they can conceive of so far.
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