Walking for as little as ten minutes can even increase the rate of your metabolism, helping you convert food into useful energy.
步行十分钟甚至可以提高新陈代谢率，帮助你将食物转化为有用的能量。
Useful energy
原声例句
生活中的科学
TED-Ed（视频版）
They'd then convert radiation into useful energy while protecting our DNA.
然后他们将辐射转化为有用的能量，同时保护我们的 DNA。
Crash Course 综合篇
We can determine how much useful energy is contained in pretty much any chemical compound.
我们可以确定几乎任何化合物中含有多少有用能量。
雅思听力文本
By doing so, an important greenhouse gas is turned into useful energy rather than being directly emitted into the atmosphere.
通过这样做，一种重要的温室气体被转化为有用的能源，而不是直接排放到大气中。
英语百科
Exergy
（重定向自Useful energy）
![Higher exergy content tends to mean higher energy prices. Here the costs of heating (vertical axis) are compared with the exergy content of different energy carriers (horizontal axis) in Finland. Energy carriers included are district heating (D), ground-source heat pump (G), exhaust air heat pump (A), bioenergy meaning firewood (B), heating oil (O) and direct electric heating (E). Red dots and trend line indicates energy prices for consumers, blue dots and trend line indicates total price for consumers including capital expenditure for the heating system. [20]](/uploads/202502/19/Cost_and_exergy_for_heating_energy_in_Finland4447.jpg)
In thermodynamics, the exergy of a system is the maximum useful work possible during a process that brings the system into equilibrium with a heat reservoir. When the surroundings are the reservoir, exergy is the potential of a system to cause a change as it achieves equilibrium with its environment. Exergy is the energy that is available to be used. After the system and surroundings reach equilibrium, the exergy is zero. Determining exergy was also the first goal of thermodynamics. The term "exergy" was coined in 1956 by Zoran Rant (1904–1972) by using the Greek ex and ergon meaning "from work", but the concept was developed by J. Willard Gibbs in 1873.
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- meander的意思