研究人员还分析了其他影响寿命的变量，如食谱、环境、代谢率等，但大脑的大小成为最有意义的预测指标。

The researchers analyzed other variables that could affect longevity like diet, environment, metabolic rates and found that the most significant predictor was brain size.

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金融学中我们常假设随机变量,例如收益率,是服从正态分布的

We often assume in finance that random variables, such as returns,are normally distributed.

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这里的问题不在于会突破某个特定的通胀率，而是一个简单的事实：通胀率一开始就被视为一种可以任意摆弄的变量。

The problem here is not that a particular rate of inflation would be breached; it is the simple fact that inflation is considered a variable to be messed with in the first place.

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