The largest animals on Earth have to spend most of their day just eating enough to keep their heat engines running.

世界上体型最大的动物们每天也需花大部分时间进食以此维持身体制热机能的运转。

We lose some of that explosion energy to things like friction, heat, engine efficiency and, most importantly, gravity.

我们失去了一些爆炸能量，比如摩擦、热量、发动机效率，以及最重要的重力。

For heat engines, efficiency is measured by the work produced for a given amount of input heat.

在热机中，效率是通过功来衡量的 该产品为一定的热量添加。

Real-life heat engines are useful, because they use the flow of heat from something warmer to something cooler to produce work.

现实的热机是有用的，因为它们 你利用热量从一件温暖的事物流向另一件寒冷的事物。

In the case of a heat engine, the change in thermal energy is zero, because it always returns to the temperature it started from.

在热机的情况下，功率的变化 热值为零，因为它总是返回一个度数。

It's a window into the Earth's interior, providing insights into plate tectonics, the heat engine driving these processes, and even the origins of life on Earth.

它是了解地球内部的一扇窗户，可以深入了解板块构造、驱动这些过程的热机，甚至地球上生命的起源。

These cooling machines are a lot like the opposite of heat engines, in the sense that they use work to make heat flow in the opposite direction that it would normally go.

这些冷却机类似于热机 反之，也就是。

Typically relying on gas-powered boilers, these could drive as far as you wanted — provided you also wanted to lug around extra water to refuel and didn't mind waiting 30 minutes for your engine to heat up.

通常靠锅炉推动，想要去多远都到得了，前提是你不介意携带额外的备用补充水，也不介意等 30 分钟烧水暖机。