Energy firms often call gas a clean fuel: burning it releases roughly half as much carbon dioxide into the atmosphere as burning coal does.
能源公司常常把天然气称作纯净的燃料：燃烧天然气进入大气层的二氧化碳量大致上是煤炭的一半。
The United States is poised to bet its energy future on natural gas as a clean, plentiful fuel that can supplant coal and oil.
由于天然气是一种清洁、储量丰富的燃料并可替代煤炭、石油等传统能源，美国正致力于将天然气作为国家的能源远景。
A key theme this year is clean transportation, including cars and buses driven by fuel cells, natural gas and other alternative sources.
今年的主题是清洁交通，这包括由燃料电池、天然气和其他替代能源驱动的轿车和公共汽车。
应用推荐