| 1. | In species of pines which are polycyclic flower initiation must occur over a wide time range .
具有多环球花的松树属种，其花的孕育期会延续较长的时间。
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| 2. | Incense is burnt in many chinese homes and polycyclic aromatic hydrocarbons have been recovered from incense smoke .
很多中国人家里点香，香的烟中已经发现有多环芳香族碳氢化合物。
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| 3. | More work is needed to uncover whether such a core exists or whether the polycyclic compounds result from the drastic treatments .
为了揭开这样一种芳核是否存在，或者多环化合物是不是由于剧烈处理所引起的问题，必须进行大量的工作。
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| 4. | Pah soil analysis . determination of polycyclic aromatic hydrocarbons
土壤分析.多环芳香烃
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| 5. | Pah soil analysis - determination of polycyclic aromatic hydrocarbons
土壤分析.多环芳香茎
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| 6. | Advances in study on photolysis of polycyclic aromatic hydrocarbons
多环芳烃光降解研究进展
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| 7. | Pcah polycyclic aromatic hydrocarbons
多环芳香族碳氢化合物
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| 8. | Adsorption of polycyclic aromatic hydrocarbons with carbon in fly ash
燃煤飞灰中碳对多环芳烃吸附作用的研究
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| 9. | The environmental behaviors of polycyclic aromatic hydrocarbons in the soil
多环芳烃在土壤中的环境行为研究进展
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| 10. | Workplace air . sampling and analysis of the polycyclic aromatic hydrocarbons
工作场所空气.多环芳香碳氢化合物的取样和分析
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