Secretary Gates is a co-chair of the task force President Obama formed to decide how to close the facility and what to do with the detainees.
VOA: standard.2009.05.06
I feel like I have to introduce concepts like variance and co-variance and correlation in order to talk about finance; so that's what we'll do in Lecture Two.
我会讲到像方差,协方差,相关系数,这样的概念,为金融学的内容作一些铺垫,我们会在第二课讲到
and your co-worker continues to discuss how to do the work rather than actually doing the work,
但你的同事仍然在滔滔不绝地谈论如何着手工作而不实际地做,
They might say my sample period was off, ... but that's what the theory-- ... using my data for the sample period that I computed-- the expected returns and co-variances says one should do.
他们可能说我的采样周期是有问题的,不过我的结果都是靠理论-,我采用自己收集的数据计算出-,预期收益和协方差可以用来指导我们的投资行为。
What do you think of Mark Zuckerberg, the co-founder of Facebook?
你觉得社交网络的共同创始人马克•扎克伯格怎么样?
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