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1·More than half of all U.S. households are heated with natural gas.

超过半数的美国家庭用天然气供暖。《柯林斯英汉双解大词典》

2·Because oil and natural gas became scarce?

因为石油和天然气变得稀缺了，是吗？

3·The amount of oil and natural gas in the Earth was still plentiful.

地球上的石油和天然气储量仍然丰富。

4·Well, there were other energy choices like oil and natural gas, right?

因为还有类似石油和天然气这种其他的资源可供选择，对吗？

5·Deflated values also mean that natural gas extractors see no reason to capture helium.

放气值也意味着天然气提取器认为没有捕获氦的需要。

6·Siduria recently implemented a program to convert heating systems from oil to natural gas.

Siduria 最近实施了一项计划：将供暖来源从石油改为天然气。

7·Then in the 80s, this trend reversed itself when the price of oil and natural gas went down.

到了80年代，随着石油和天然气价格的下跌，这一趋势发生了逆转。

8·Natural gas and coal—also fossil fuels—have similarly seen price declines that look to be long-lived.

天然气和煤炭，还有化石燃料，也出现了类似的价格下跌，而且看起来会持续很长时间。

9·Dakota Gasification of North Dakota captures CO2 at a plant that converts coal into synthetic natural gas.

北达科他州的达科他气化在一个将煤转化为合成天然气的工厂捕捉二氧化碳。

10·Petroleum, consisting of crude oil and natural gas, seems to originate from organic matter in marine sediment.

石油由原油和天然气组成，它们似乎来源于海洋沉积物中的有机物质。