已开发出多种燃料电池，主要用于宇宙飞船，其效率是蒸汽机的两倍以上，并可长期运转。
Fuel cells of many types have been developed, chiefly for use in spacecraft; their efficiency is over twice that of a steam engine, and they can operate indefinitely.
已开发出多种燃料电池，主要用于宇宙飞船，其效率是蒸汽机的两倍以上，并可长期运转。
Fuel cells of many types have been developed, chiefly for use in spacecraft; their efficiency is over twice that of a steam engine, and they can operate indefinitely.
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