This might be expressed in what many call a bell curve.

考核结果可以用我们大家所说的钟形曲线来展现。

On a bell curve of performance, there was overlap between the younger and older groups.

年轻组和大龄组的数据所构成的钟形曲线有重合的部分。

“It’s a pretty famous function, ” Graziano says of this bell curve in the sky. (June 2009.)

图2：格拉齐亚诺在谈到这个天空中的钟形曲线时说：“这是一个非常著名的函数。”