polycyclic orogenesis多旋回造山运动;复相造山运动
polycyclic landform多旋回地形
polycyclic aromatics多环芳香烃
polycyclic system多环体系
polycyclic musk多环麝香
polycyclic disease多循环病害
Polycyclic groups多循环群
polycyclic arene多环芳烃
polycyclic carcinogen多环致癌物质
ADJ（形容词） (of a molecule or compound) containing or having molecules that contain two or more closed rings of atoms 多环的
N（名词） a polycyclic compound 多环化合物
anthracene is a polycyclic