Both natural gas and biogas create emissions when burned, but far less than coal and oil do.

天然气和沼气燃烧时，都会产生二氧化碳，但是要比煤和石油少得多。

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But the cleanliness of natural gas is largely based on its lower carbon dioxide emissions when burned.

但是天然气的清洁特性主要是基于其在燃烧时较低的二氧化碳排放量。

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They also tend to produce poor-quality coal which generates relatively high levels of pollution when burned.

他们也倾向于生产劣质煤，这些煤在燃烧时产生相对高的污染水平。

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Pacemakers can explode when burned.

VOA: special.2010.06.29

We have first of all, the whole offering or "burnt offering," it's sometimes called. This is when an animal is entirely burned to create, as the text says, a pleasant smelling odor or pleasant smelling smoke that ascends to God.

第一个，整祭品或者有时候被叫做“烧祭品“,动物被整个燃烧，散发一种，正如文章中所说的，一种令人愉悦的气味,或者一种令人愉快的烟雾，上升到上帝面前。

耶鲁公开课 - 旧约导论课程节选

He was up on a pyre, and he was going to be burned when he remembered Solon, the Greek, who had come to him and warned him about the vain glory, and he said,oh Solon, oh Solon.

他在火葬柴堆上,在即将被烧死之时想到梭伦,这个希腊人曾警告过他,这只是虚荣而已,他感叹着,哎,梭伦,哎,梭伦

耶鲁公开课 - 古希腊历史简介课程节选

One danger was that the club's sound insulation was made of styrofoam, which releases toxic fumes when burned.

CNN: Harrowing stories emerge from nightclub's ashes

More seriously, it can release harmful chemicals into the soil and water when dumped, or into the air when burned.

ECONOMIST: Talking rubbish

Acid-treated lignin emits sulfur dioxide when burned.

FORBES: Ethanol