By the 1990s, energy-dense nickel-metal hydride batteries were on the market, soon followed by lithium-ion batteries.

到了 20 世纪 90 年代，市场上出现了高能量密度的镍氢电，很快，锂离子电也问世了。

Lithium ion batteries are much smarter than older nickel cadmium or nickel metal hydride rechargeable batteries.

锂离子电比旧的镍镉镍金属氢化物可充电电智能得多。

A lot of those battery life myths you might hear apply to nickel-cadmium and nickel-metal hydride batteries.

你听到的很多关于延长电寿命的小窍门，仅适用于镍镉和镍氢电。

Hybrids aren't true electric vehicles; their nickel-metal hydride batteries are only used to optimize the efficiency of gas-burning engines.

混合动力车并不是真正的电动汽车；他们的镍氢电仅用于优化燃汽油发动机的效率。

Take sodium hydride, for example — a superbase that’s just sodium bonded to a hydrogen.

以氢化钠为例——这是一种超强碱，由钠与氢结合而成。

Then there are nickel cadmium and nickel metal hydride batteries.

然后还有镍镉电和镍氢电。