摘 要: | In the 20th century,the industrial civilization has grown by leap and bounds with fuels like coal,petroleum,and natural gas as its power.Human beings,however,are plagued with two big problems-energy exhaustion and environmental pollution-when enjoying the excellent material life thanks to the modern civilization.They are gradually developing and adopting new energy with the hopes of solving the two problems and achieve a sustainable economic growth.[第一段]
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