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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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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Waterfront area develops as the vibrant component in organizing urban scenery because of its activity and penetrability, which indicates profound cultural details and profuse substance civilization.

滨水区以其活跃性和穿透力而成为城市景观组织中最富有生气的元素，它集中体现了城市深厚的文化积蕴和丰富的物质文明。

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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

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