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| Chinese | English |
| 多环碳氢化合物 | 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。) |
| 多环芳香碳氢化合物 | polycyclic aromatic hydrocarbon Hydrocarbons containing two or more closed rings of atoms (包含两个或多个闭合原子结构的环状碳氢化合物。) |