戒烟者与未戒烟组相比，戒烟是最重要的生存因子，使病人的死亡率下降近40%。
When comparing quitters with persistent smokers, quitting smoking was the most important survival factor, reducing patients' mortality risk by 40%.
科学家说这个新的证据首次表明脑袋尺寸是影响动物在城市环境中生存的关键因子。
Scientists say this new evidence is the first to show that brain size is a key factor for animals' survival in urban environments.
为了帮助理解接下来的步骤我们可以这样考虑这个过程：一个复制因子(基因)为了自己的生存繁衍建造了一些运载者(植物和动物)。
To help understand the next step we can think of this process as follows: one replicator (genes) built vehicles (plants and animals) for its own propagation.
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