The sun, is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downward.

太阳在长期内也是变化的：它的热量输出在周期中有上升，也有下降，最近的趋势是下降。

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It removes heat from the air outside or the ground below and uses it to supply heat to a building or its water supply.

它从外面的空气或下方的地面收集热量，并用此来供应建筑物或其供水所需的热量。

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Earth has been able to support life because its position relative to the Sun provided it with enough heat, but not too much heat for early bacteria to evolve.

地球之所以能够维持生命，是因为它相对于太阳的位置为它提供了足够的热量，但热量没有多到可以让早期的细菌进化。

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It either had work, got its heat from the surroundings, or it got worked on by the surroundings.

系统从环境中，得到热量。

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If I then put it back into its original condition, lower the heat say, temperature back to body temperature and reduce the pH down to seven again, the molecules will re-nature.

假如我把烧杯的温度恢复到初始状态,降低温度,温度降低到体温,将pH值降低到七,这些分子会复性

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The processor then hung too close to the fan, its heat causing a sensor to go off which automatically shut down the server.

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