Fortunately, a single gene mutation rarely causes things to go horribly wrong.
幸运的是，一个单一的基因突变很少导致严重错误的东西。
Although a recent study found that a single gene mutation heightened the risk of obesity by up to 67 percent, genetics cannot explain the skyrocketing obesity trend.
尽管最近的研究发现单基因突变使肥胖的风险增加高达67%，但是遗传不能解释飞涨的肥胖趋势。
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