nude matter

例句：

1. 1. The study focused on the effects of nudity on human health.
   该研究关注裸体对人类健康的影响。
2. 2.In some cultures, nudity is a common practice during religious ceremonies.
   在一些文化中，裸体是宗教仪式中的常见习俗。
3. 3. The researcher found that nudity could have both positive and negative effects on mental health.
   研究者发现裸体对心理健康既有积极影响也有负面影响。