UVR

例句：

1. 1. The sun's rays are responsible for the photosynthesis of plants.
   太阳的光线负责植物的光合作用。
2. 2. UV rays can cause skin cancer.
   紫外线可能导致皮肤癌。
3. 3. Ultraviolet light is a form of electromagnetic radiation that penetrates through clouds and reaches Earth's surface.
   紫外线是一种穿透云层到达地球表面的电磁辐射形式。