赫克特特别注意追踪特定的一种多环芳烃——菲，因为菲存在于香烟烟雾中。
One specific type that Hecht was particularly interested in tracking was phenanthrene, which is in cigarette smoke.
为了研究香烟中的成分是怎样影响人类DNA的，赫克特和他的研究小组对12名志愿者进行了 PAH，即多环芳烃追踪。
To study how a cigarette's contents impact human DNA, Hecht and his team used 12 volunteers to track PAHs, or polycyclic aromatic hydrocarbons, which are pollutants found in tobacco smoke.
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