An urban heat island is created when dark colored man-made materials used in the construction of a city absorb the sun's rays and release that energy back out as heat.

深色的人造建筑材料吸收太阳辐射，并将获取的能量以热量的形式释放出来，城市“热岛效应”随即产生。

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Its purpose is not to shield radioactive emissions but to prevent the release of radioactive dust and other materials, and to keep out rainwater, which could carry contaminants into the water table.

它的作用不是用来遮挡放射性排放而是阻止放射性烟尘和其它物质的释放，以及遮挡雨水以防止雨水携带污染物流入地下水。

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When a current is applied across the sandwich, the electrons and holes team up at the junction of the two materials and release energy in the form of light.

电流流过夹层，电子和空穴在两种材料接口处共同发挥作用，释放光能。

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They have a primary and a secondary containment structure, both made from thick reinforced concrete, to protect against the release of radioactive materials.

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When a current is applied across the sandwich, the electrons and holes team up at the junction of the two materials and release energy in the form of light.

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