The researchers are analyzing the chemical makeup of earlier and later coal deposits for measures of ancient carbon dioxide, temperature, rainfall and other variables.

为了测算出远古时候的二氧化碳、温度、降雨量和其他一些参数，研究人员正在分析早期和晚期煤炭矿床中的化学成分。

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Other specialized chemical washes may be used in the remedial treatment of scales or paraffin deposits in production tubulars.

其它的特殊的化学冲洗剂可用于对生产管中的水垢或石蜡沉积进行补救性处理。

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Based on the analysis and research of AGB granite rock texture, mineral composition, chemical components, we explore the evolution of granitoids and tantalum lithium deposits relationship.

从雅山花岗岩岩石结构构造、矿物成分、化学成分等变化规律分析研究入手，探讨雅山花岗岩类的演化与钽锂矿床成生关系。

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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

Fracking is a drilling process that frees gas from deep rock deposits by injecting wells with chemical-laced water at high pressure.

WSJ: Record: Libous ended stake in firm eyeing fracking

The bans stem from local residents' concerns about potential adverse impacts if the state lifts its 5-year-old moratorium on gas drilling using high-volume hydraulic fracturing, or fracking, which frees gas from deep shale deposits by injecting wells with chemical-laced water at high pressure.

WSJ: NY appeals court to consider local fracking bans