AIM: in order to improve the clarity and quality of Ginkgo leaf water-extraction solution, and optimize the production process.

目的：为了提高银杏叶水提液的澄清度和药品质量，优化生产工艺。

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Extraction of water depends on two properties of the aquifer: porosity and permeability.

水的开采取决于含水层的两个性质：孔隙度和渗透性。

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The researchers used water and an ultrasonic extraction process, followed by gas chromatography-mass spectrometry to quantify the amount of cocaine in more than 230 bills collected in 17 cities.

研究人员从17个城市收集到230张纸币样本，并使用水和超声波提取方法，再加上气相色谱分析-质谱法对样本进行测试。

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Environmentalists strongly oppose shale-gas extraction due to fears that fracking may contaminate water supplies, the oil-sands industry because it is energy-intensive and dirty, and deep-water drilling because of the risk of oil spills like last year's Gulf of Mexico disaster.

WSJ: Big Oil Companies Are Shifting Their Focus Back to the West

Still, the MIT report points out that shale-gas extraction uses less water than other industries, and indeed than other sources of energy.

ECONOMIST: Shale gas��s poor image in Europe is largely unjustified

For BP Amoco's soft-spoken CEO, Sir John Browne, deep water offers the prospect of the largest untapped reserves and the lowest-cost means of extraction.

FORBES: Going deep