一种方法是海水蒸馏，通过加热卤水可以得到浓缩的水蒸气，这种方法每淡化1立方米的海水需要10千瓦时的电量。
Some employ distillation, which needs about 10 kilowatt-hours (kWh) of energy per cubic metre of seawater processed. Brine is heated, and the resulting water vapour is condensed.
当这一车型的16千瓦时的电池组用尽时，它会自动切换到燃气发动机——这一转换过程非常平滑(在行驶中几乎无法察觉)。
When the car's 16-kilowatt-hour battery pack becomes depleted, the car automatically switches to a gas engine-a transition that is remarkably smooth (it's nearly impossible to discern on the road).
但是健康饮食和电费单不同，这不仅仅是像减少千瓦时用电一样食用更少的盐或糖那么简单。
But a healthy diet isn't like an electricity bill; it's not as simple as using less salt or sugar as though you were cutting down on your kilowatt hours.
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