Ultraviolet light or radiation is what causes your skin to become darker in colour after you have been in sunlight. In large amounts ultraviolet light is harmful.
例句
The sun's ultraviolet rays are responsible for both tanning and burning.阳光中的紫外线是皮肤晒黑和灼伤的根源。
英汉词典释义
adj.
(光)紫外的，紫外线的，利用紫外线的
It's called ultraviolet rays.它被叫做紫外线。
英英词典释义
Noun
1. radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays
Adjective
1. having or employing wavelengths shorter than light but longer than X-rays; lying outside the visible spectrum at its violet end;