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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For the Earth to maintain a constant average temperature, such emissions from the planet must balance incoming solar radiation.

为了使地球保持恒定的平均温度，来自地球的这种辐射必须平衡入射的太阳辐射。

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The batteries will enable a constant electrical output from sources such as wind or solar, which stop generating when the weather changes or night falls.

电池可以利用诸如风力或太阳能之类的来源提供源源不断的电能，即使在天气改变或夜晚奖励的时候不能再生成电能。

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Because they finance the upfront cost of the solar system, they have an constant need for capital to reach scale.

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That's because meeting global energy needs requires constant investment on a scale unmatchable by economically uncompetitive sources like solar, wind and biofuels.

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While the ship will not travel at warp speed, with an ion propulsion engine powered by a 1.5GW nuclear reactor, it can travel at a constant acceleration so that the ship can easily get to key points of interest in our solar system.

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