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1. In Greek mythology, the sigma is often associated with Zeus.
在希腊神话中，σ是宙斯的象征。
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2. In mathematics, the sigma function is used to calculate the area under a curve.
在数学中，σ函数用于计算曲线下的面积。
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3. The standard deviation of a population is an important measure of its spread around the mean.
一个群体的标准差是衡量其围绕均值分散程度的重要指标。