Constant variations in the amount of sunlight available on Earth at any given location make energy storage a necessary design feature of terrestrial solar-energy systems.

在地球上任何一个特定地点，阳光的不断变化使能量储存成为地球太阳能系统的一个必要设计特征。

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Only a small amount of the Sun's energy reaches the Earth, but this is enough to power our weather systems.

到达地球的只是一小部分的能量，但这足以影响我们的天气。

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There are 3 kinds of sources of energy for the hazard systems, i. e. the solar earth system, the global system and the human system, respectively.

灾害系的能量源归属于三大类：日地系统、地球系统和人类系统。

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Geothermal systems gather energy present beneath the earth's surface, where the temperature averages 55 degrees (higher in Texas, lower in North Dakota), and concentrate it to provide space heating.

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