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| polycyclic hydrocarbon Hydrocarbon molecule with two or more nuclei; examples are naphtalene, with two benzene rings side by side, or diphenyl, with two bond-connected benzene rings. Also known as polynuclear hydrocarbon (碳氢分子与两种或两种以上的细胞核相结合，例子包括萘；有两个苯环，肩并肩，或二苯，有两个连接键的苯环。也称为多核碳氢化合物。) | |||
| 多环碳氢化 合 物: 2 phrases in 1 subject |
| Environment | 2 |