There are two kinds of coal: steam coal, which is used to generate electricity, and metallurgical coal, which is used in the production process for certain metals - especially steel.

煤炭分两种：动力煤(用来发电)和冶金用煤(在某些金属的生产过程中使用，尤其是钢)。

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A machine with a productive life of many years that is used in the production process wears out over time and at the end of its lifetime needs to be replaced.

如果生产流程中使用的一台机器的寿命有很多年，那么它的价值将随着时间消耗，并需要在使用年限到期时更换。

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The composite materials can also be used in a factory-type production process, says Mr Dowson.

Dowson先生说，复合材料同样可以应用到批量生产过程中去。

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Cyanide and other chemicals used in the production process are also cheaper than they were in the third quarter of 2008.

FORBES: Magazine Article

As background, hydraulic fracturing is a multi-step process commonly used in oil and natural gas drilling to bolster eventual production from wells.

FORBES: Miami University Students and This Quant Pitch C&J Energy Services

At issue is whether the public has a right to know what chemicals are used in the extraction process and whether EPA has the ability to oversee wastewater disposal from oil and gas production.

FORBES: EPA Won't Take It -- Nor Should They