Methane is a colorless, odorless and flammable substance which forms a major component in natural gas.

甲烷是一种无色，无味，易燃物质，是天然气的重要组成部分。

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The yellow substance was gypsum, or calcium sulfate dehydrate, a common component of plaster.

这种黄色的物质叫做脱水硫化钙，通常是石膏的一种组成部分。

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Main component self-compare without calibration factor can also be used when there is no impurity reference substance.

当没有杂质对照品时，也可采用不加校正因子的主成分自身对照法。

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One of the pollutants was a fine particulate substance known as PM2.5, a major component of diesel exhaust which EPA had determined to be unsafe for inhalation at any level, particularly for health-impaired and elderly populations.

FORBES: EPA Charged With Lethal Experiments On Hundreds Of Unsuspecting Subjects

The hope is that pairing up researchers and businesses will hasten the development of material and component manufacturing processes for the carbon-based substance, and make it possible for graphene to find its way into products such as flexible electronics, batteries and faster processors.

ENGADGET: EU backs consortium in billion-euro program to hasten graphene development