UV深入程度（UVC， UVB， UVA）https://mp.weixin.qq.com/s?__biz=MzkwNTM0Njk3MA==&mid=2247483934&idx=1&sn=92d1ba67ead404e7714af11ec0526786&chksm=c0f868ebf78fe1fd0610493e6f49a5d90835a20a829a900746906cda12f2fa