ultra violet
柯林斯词典
1. ADJ 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. 紫外的
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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