总之，从我当时住的公寓到图书馆可是一段很长的距离，所以即使我在离开前已经吸过一根烟，我还是决定再来一根来消磨这段时间。
Anyway, it was kind of a long walk to the library from the apartment I was living in at the time, so even though I had just had a smoke before I left, I decided to have another to pass the time.
如果一个人有这种基因，那么他在吸完一根烟后血液和大脑中的尼古丁保持较高的含量的时间就会更长。
If a person has this gene, their blood and brain nicotine levels stay higher for longer after smoking a cigarette.
如果一个人有这种基因，那么他在吸完一根烟后血液和大脑中的尼古丁保持较高的含量的时间就会更长。
If a person has this gene, their blood and brain nicotine levels stay higher for longer after smoking a cigarette.
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