The method relies on measuring how chemical variations in drinking water show up in people's hair.

这种方法的依据是测量饮用水中的化学物质在人的头发中的变化。

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It has been proved that Low Till Farming increases harvests and reduces water use, and this method reduced the need for chemical products because there are fewer unwanted plants.

实践证明，低耕农业提高了作物产量，减少了用水量；而且，由于有害植物变少了，这种农业对化工产品的需求也降低了。

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The most commonly used gene delivery methods include: physical method, chemical methods, fusion method and gene gun etc.

目前基因转运方法有许多种，其中包括物理方法、化学方法，融合法，基因枪等。

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They also will study chemical and physical properties of the soil samples with a method called infrared spectroscopy.

VOA: special.2009.01.20

I've always been against any chemical method of enhancing performance.

FORBES

Buchholz, a physicist and a nuclear engineer, is an expert at something called accelerator mass spectrometry, an extraordinarily precise method of determining the chemical composition of materials.

FORBES: Magazine Article

The method apparently deposits an invisible chemical on the blank paper, which can then be revealed with the correct developing solution.

BBC: Spy tactics revealed by book