ultraviolet rays
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夏は紫外線が強いので日焼け止めが必要だ。
In summer, ultraviolet rays are strong, so sunscreen is necessary.
紫外線を浴びすぎると肌に悪い。
Too much exposure to ultraviolet rays is bad for the skin.
このカーテンは紫外線を防ぐ効果がある。
These curtains have the effect of blocking ultraviolet rays.