1·As long as they are constantly supplied with fuel and oxidant, fuel cells can continuously produce power, removing the need for recharging.
只要能够不断地获得燃料和氧化剂,就能连续产生电能而无需再充电。
2·Cynthia Graber reports Batteries add weight, and they need recharging.
辛西亚格拉贝报道说,电池不仅增加重量而且需要再充电。