燃料电池是将化学能直接转化为电能的电化学装置，它以氢、天然气及碳氢化合物为燃料，从而产生电能。
A fuel cell is a device that can convert chemical energy to electricity. It generates electricity from fuel such as hydrogen, natural gas and other hydrocarbons.
RTG已为许多太空任务提供动力，包括美国宇航局的“卡西尼号”和“新视野”探测器。在放射性物质的小球衰退过程中可以产生出热量，从而将其转化为电能。
RTGs power many space missions — including NASA's Cassini and New Horizons probes — as the slow decay of small pellets of radioactive material produces heat that can be turned into electricity.
其首个14英尺高的试验装置所产生的电能足以供给平均150户欧洲家庭，从而每年消减超过450万吨的二氧化碳温室气体排放。
The first 14-foot test unit produced enough energy to supply 150 average European homes and saved the emission of over 450 tons of CO 2 greenhouse gas each year.
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