Much of rural North America, up until that time, had been relegated to farming, ranching and other resource extraction activities.

直到当时，北美乡下的许多地方已经开展了农业，畜牧和摄取其他资源的相关活动。

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Fucoidan is a sulfated polysaccharide from brown seaweed, which has a variety of biological activities. the studies on the extraction, purification and fraction of fucoidan are summarized.

褐藻糖胶是存在于褐藻中的硫酸酯多糖，具有多种生物活性。本文综述了褐藻糖胶的提取、纯化和分级等方面的研究工作。

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The extraction of acoustic characteristics of ocean sediment has great importance to civil and military activities.

海底沉积层声学特性提取在军事和民用上都具有重要意义。

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While the company is among the higher-cost operators in its gold extraction activities, its silver bi-product sales reduce the net cost to among the lowest in the industry.

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Anyone considering the use of MIW for natural gas extraction activities has the potential to incur long-term liability because just the act of moving contaminated water gives you total responsibility for it in the future.

FORBES: Fracking With Bad Water

It has adjusted UK gross value added, a measure of economic output, to exclude energy extraction and use, and also financial and insurance activities.

BBC: How pretty is the UK without the "bad bits"?