The sun's ultraviolet rays are responsible for both tanning and burning.

太阳的紫外线是皮肤晒黑和晒伤的原因。

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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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Many types of radiation, especially ultraviolet rays from the Sun, can damage skin cells and cause cancer.

许多类型的辐射都会损害皮肤细胞并导致癌症，尤其是来自太阳紫外线的辐射。

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These tools span much of the electromagnetic spectrum from X-rays to ultraviolet to the infrared - and of course microscopy with visible light.

BBC: Terahertz scanner reveals hidden fresco at Louvre

But a product's SPF indicates only its ability to defend against sunburn-causing ultraviolet-B rays and not against ultraviolet-A, which penetrate deeper into the skin and cause premature aging. (Both types contribute to skin cancer.) For example, a person wearing SPF 50 could spend considerable time in the sun without getting burned.

WSJ: The Myths of Daily Sunscreen

"She's" sticking to a fairly predictable road with pink stitching in the seats, pink tweaks in the dashboard and a windshield that the company says blocks more ultraviolet rays.

CNN: Honda's pitch: She's pretty in pink