承载着各种基因的DNA分子就象一根长长的细线，并依一定规则扭曲成染色体，而端粒就象一顶帽子那样覆盖在染色体末端。
The long, threadlike DNA molecules that carry our genes are packed into chromosomes, the telomeres being the caps on their ends.
他们选择的对象既有生活水平非常高的也有非常低的，并且，他们覆盖了其中的20000个基因来观察dna甲基化的差异。
They chose subjects that had come from either very high or very low standards of living, and they looked at differences in DNA methylation across some 20, 000 genes.
研究的第二部分研究了16053个覆盖一定体重范围的普通欧洲人的基因组。
The second part of the study looked at the genomes of 16,053 European people in the general population, reflecting a range of weights.
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