Our society demands that more and more materials be extracted from the earth. 我們的社會需要從地下開採越來越多的資源。
Brazil is trying to develop energy from its immense resourses of biological materials by literally growing its own fuel. 巴西腳踏實地生產自己的燃料，正試圖從豐富的生物資源中開發能源。
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