Danielle Lyons, wife of Corporal Corey Lyons,23,said she wished the weekend would never end and they did not have to return to Walter Reed hospital.

VOA: standard.2009.08.01

If we add one to the return, then you've got a number that's never negative and we can then use geometric returns.

然后加上1,你永远也得不到一个负数,然后我们对这个值求几何平均

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And if you've never used those, they're usually above your Return key.

如果你从来没用过这些竖线，它们在,回车键的上面。

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This would be good luck if you were long and now suddenly you got a huge return that you would not have thought was possible since you've never seen it before.

如果你长期持有这份投资,你就走运了,回报如此之高,你自己都没有料到,可能你也从来没有见过这种情况

耶鲁公开课 - 金融市场课程节选