When the canister is ignited, the iron burns and produces the heat energy required for the chemical reaction.

当罐被点燃时，铁燃烧并产生化学反应所需的热能。

But there has been talk of possible development of the area for geothermal energy -- heat that comes from the Earth.

但近来有人提议要在该生态系统内发展地热能--来自地球的热源。

Fuel fuel is something that creates heat, or energy, heat is the fuel that comes from fire.

燃料燃料是产生热量或能量的东西 热是来自火的燃料。

Around 11,000 years ago, humans found a way to harness a small portion of the earth's heat energy that was close to the surface.

大约在一万一千年前，人类找到了一种方法来利用地球表面的一小部分热能。

They are an equalizer, so they take the heat energy from the tropics, and they translate that where we need it into the colder climates.

它们其实是一种平衡调节器，带走热带地区的热量，然后传到寒冷气候的地方。

The water in sweat absorbs your body's heat energy and then evaporates off of you when it reaches the surface, which in turn lowers your temperature.

汗液中的水分会吸收身体的热能，然后在到达体表时蒸发掉，从而降低体温。

And hydrogen creates all the sun’s energy. Heat and light energy is created all the time in the sun’s core as a result of gas explosions or nuclear reactions.

太阳所有的能量由氢气产生。在太阳核心处不断发生的可燃气体爆炸和核反应产生了热能和光能。

So, from a chemical standpoint, charcoal seems like the better fuel source, because it’s mostly carbon, burning it releases more heat energy for a longer period of time, with fewer smoky byproducts.

因此，从化学的角度来看， 木炭似乎是更好的燃料来源，因为它主要是碳， 燃烧它会释放更多的热能并持续更长的时间， 而且产生的烟熏副产品更少。