Volt应对覆盖问题，很有趣，是搭载一台给蓄电池充电的汽油发动机。
The Volt's answer to range anxiety, interestingly, is to carry a gasoline engine onboard to recharge depleted batteries.
此外，给nimh蓄电池组充电是个麻烦的过程，因为随着存储电能总量的增加，必须谨慎减少电压。
Also, charging a NiMH battery is a tricky business because the voltage has to be carefully reduced as the amount of energy being stored increases.
让蓄电池制造商左右为难的是，充电的速度取决于电解质与电极之间接触的面积。
The battery-maker's dilemma is that the recharging rate depends on the area of contact between electrolyte and electrode.
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