polycyclic disease

例句：

1. 1. The molecule is composed of multiple rings.
   这个分子由多个环组成。
2. 2.Polycyclic aromatic hydrocarbons are found in many environmental pollutants.
   多环芳烃在许多环境污染物中被发现。
3. 3. Polycyclic compounds have been studied for their potential health benefits.
   多环化合物因其潜在的健康益处而受到研究。