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，市场上出现了高量密度氢电，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.

锂离子电比旧或金属氢物可充电电得多。

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

你听到很多关于延长电寿命小窍门，仅适用于和氢电。

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电动汽车；他们氢电仅用于优燃汽油发动机效率。

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

以氢钠为例——钠与氢键合超级碱。

The sodium hydride could be combined with water to produce sodium hydroxide and hydrogen gas.

氢钠可以与水结合产生氢氧钠和氢气。

Since superbases quickly react with water, sodium hydride can be used as a drying agent, to dry chemicals in the lab.

由于超级碱与水迅速反应，氢钠可用作干燥剂， 用于干燥实验室中学品。