so all of these things with addition of the deviation of the policy, personnel and material to Iraq, led to the turnanoud.

所有这些事情加上政策，人员，物资向伊拉克的转移，使得局势有了改变。

普林斯顿公开课 - 国际座谈会课程节选

Let's suppose that all of them are the same-- they all have the same standard deviation.

我们假设这些资产的收益率标准差-,均相等。

耶鲁公开课 - 金融市场课程节选