EN: Ultraviolet (UV) radiation is electromagnetic radiation with wavelengths shorter than visible violet light. - UV photons have relatively high energy and can cause chemical changes (e.g., sunburn).

中文：紫外线（UV）是波长比紫光更短的电磁辐射。 - 紫外光子能量较高，可能引起化学变化（如晒伤）。