Gas mixtures emitted from present-day volcanoes resemble this early atmosphere, suggesting its origin from volcanic eruptions.

现代火山释放出的气体混合物类似于这种早期的大气，这表明它（地球）起源于火山喷发。

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Many scientists now attribute much of the warming of early Earth to oxygen-intolerant microbes—methanogens—that produce the greenhouse gas methane.

现在，许多科学家把早期造成地球变暖的大部分原因归结于厌氧微生物——产甲烷菌——它产生了温室气体甲烷。

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Coal gas rivaled smoky oil lamps and flickering candles, and early in the new century, well-to-do Londoners grew accustomed to gaslit houses and even streets.

煤气可与烟雾缭绕的油灯和摇曳不定的蜡烛相媲美，在新世纪之初，富裕的伦敦人逐渐习惯了有煤气照明的房子，甚至街道。

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