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Suppose you could find 10,000 independent assets, then you could drive the uncertainty about the portfolio practically to 0.
假设你能找到一万项相互独立的资产，那么你就可以将这个投资组合的风险,降到几乎为零。
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All right, so you can't get perfect efficiency, 0 but at least if you were able to go to zero degrees Kelvin, then you'd be all set.
好吧，你得不到完美的效率，但至少如果能把温度降到,那你就万事俱备了。
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Over the next several months, unemployment began to subside irregularly, 6.3% down to 6.3% by June 1930.
接下来几个月，失业率开始不规则地降低，直到1930年降到。
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So, we have a problem here if we're thinking about keeping things at the lowest energy, so there's a lot of ring strain in the system.
现在有个问题,我们考虑要把能量降到最低，所以环上有许多应力。
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And then, it's, for all intents and purposes, falls to zero.
然后，无论如何，它会降到。
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That has moved around a lot, but it got almost up to 60% in the post World War II period and now it's down to less than a third.
计算所得的百分率变动很大,二战后,它一度达到将近60%,现在又降到不到三分之一
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If the temperature drops below a certain level it sends a signal, 'turn on the heat', and that signal stays on until it gets a negative signal to turn off.
如果温度降到一定程度以下时,探测器会发送一个信号,打开加热器,直到加热器再收到关闭的信号,它就会一直开着
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It will bottom out at some point.
在某时它会降到最低点。
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We didn't even have income tax until 1913 when the Supreme Court allowed it, so it was zero, then it went up to 90%-- or actually it was 94% at the peak--and it came down to 15%.
直到1913年最高法院允许征收的时候,我们才开始征收所得税,开始税率是零,而后飙升到90%,然后它最高达到94%再降到15%
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All right, so gamma, the gas is cooling so V2 is going to be less than it what would be if the temperature kept constant.
气体温度下降了,于是V2会比等温过程,降到相同压强时的体积要小。
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So that explains why they're so reactive, they're all very willing to give up that one s orbital and then drop to a lower energy level.
这就解释了它们的化学性质为什么非常活泼，它们都很愿意失去那个，s，电子,然后降到更低的能级上去。
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And yet the unemployment never came down below double digits for the entire decade.
但是失业率,从来没降到两位数以下,整个30年代都这样。
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It's gone down from over 90% to 15%.
税率从超过90%降到15%
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