When the sun's rays hit the earth, a lot of the heat is reflected back into space.

太阳光线照射到地球时，大量的热被反射回太空。

《牛津词典》

Heat, too, makes our environments tolerable and some ultraviolet rays penetrate the atmosphere.

热也使我们的环境变得适宜生存，而且一些紫外线会穿透大气层。

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Melanin has an extremely important role- it absorbs UV light and dissipates the UV rays as heat.

黑素有着很重要的作用——它可以吸收紫外线，并可以像释放热量一样驱散紫外线。

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Using heat-rays on the enemy might look bad in the newspapers, and put civilians off their breakfast.

ECONOMIST: Electromagnetic weapons

But the earth itself radiating energy outwards in the form of long-wave heat rays.

FORBES: A Call to Arms on Climate Change

The museum is newly illuminated by 3, 800 individual LED lights, which lack the paint-destroying heat and UV rays of incandescent bulbs.

BBC: Rijksmuseum set for grand reopening in Amsterdam