For anything to be a viable source it needs to have a higher energy output than the energy input used to generate the power.

任何东西要成为可行的能源，它的输出能量必须高于用于发生反应的输入能量。

If the energy input from calories is greater than the energy output from physical activity, the body stores the extra calories as fat.

如果卡路里输入的能量大于身体活动输出的能量，身体就会将多余的卡路里储存为脂肪。

On the other hand, if we charged at the energy input of a microwave which is roughly 1,500 Joules per second, it would only take 1.9 hours!

另一方面，如果我们以微波炉的能量输入来充电，大概是每秒1500焦耳，那就只需要1.9个小时！

" Incineration produces toxic by-products; requires a lot of heat—so a lot of energy input to bring it down to something that you can get rid of." University of Illinois chemistry professor Steve Zimmerman.

然而：“焚烧会产生有毒的副产品;需要大量的热量 - 所以大量的能量输入， 把它降低到你可以摆脱的东西。 伊利诺伊大学化学教授史蒂夫·齐默尔曼。