然后考虑到泊阿松跳过程带来的风险，又采用最小方差对冲策略将风险重新对冲，得到了期权定价方程。
Then, considering the risk bringed by Poisson jumps, the option pricing equation is gotten by minimal-variance hedging strategy.
在矩形网格上的九点差分近似的正确公式。使用它，在均质情况下，对拉普拉斯方程、布阿松方程和热传导方程可以构造出高阶精度的差分近似。
Under homogeneous conditions, the application of this equation may give a differential approximation of high order accuracy for Lapace equation, Poisson equation and heat conduction equation.
阿森松岛之窗是1885年为纪念亨利·詹姆斯·格拉塞校长而建造的。
The ascension window was built in 1885 in memory of rector Henry James Grasett.
这个微小的阿森松热带岛屿很不容易找到。
四十年后，阿森松岛又为英国夺回福克兰群岛架起了一道空中桥梁。
Forty years after that, Ascension provided an air bridge when Britain fought for the Falkland Islands.
由于受南部非洲干燥信风冲击，阿森松只是一个干旱的小岛。
Ascension was an arid island, buffeted by dry trade winds from southern Africa.
“我们知道我们生活在岩石上，但阿森松岛可怜的人们是生活在火山灰渣上，”圣赫勒拿岛的居民在他离开之前曾开玩笑说。
"We know we live on a rock, but the poor people of Ascension live on a cinder," the residents of St Helena had joked before his departure.
原本被作为监视流放中的拿破仑的前哨，阿森松岛位于南美洲与非洲之间，在达尔文时代是大西洋一个繁忙的中转站。
Originally used as an outpost to keep an eye on Napoleon in exile, Ascension Island, between South America and Africa, was a busy Atlantic waystation in Darwin's day.
两百年前，阿森松岛是一个贫瘠的火山结构残迹。
Two hundred years ago, Ascension Island was a barren volcanic edifice.
他对BBC说：“在阿森松岛达尔文收到他的剑桥导师，约翰亨斯洛的信。”
He told the BBC: "Awaiting Darwin on Ascension was a letter from his Cambridge mentor, John Henslow."
按照气候预测的推断，如果附近的海水温度继续上升，阿森松岛很可能会变得更加潮湿，岛上的植被也会更加茂盛。
If nearby ocean temperatures climb higher still, as climate projections would have them do, Ascension will probably become ever moister and greener.
他们创造了一个自我维系和自我繁殖的生态系统，让阿森松岛更适合人类居住。
They created a self-sustaining and self-reproducing ecosystem in order to make Ascension Island more habitable.
戴夫·威尔金森博士是利物浦约翰·摩尔大学的生态学家，写有大量关于阿森松岛奇特生态系统的文章。
Dr Dave Wilkinson is an ecologist at Liverpool John Moores University, who has written extensively about Ascension Island's strange ecosystem.
阿森松岛就是一个最好的例子。
而阿森松岛的故事传出了一个充满希望的信息。
即使尼克松的老板阿布·维尔县督学埃文·伦道夫对这种做法也表示不安。
Even Nixon's boss, Abbeville County superintendent Ivan Randolph, is unsettled by the practice.
像阿姆·罗德这样的肢残人士的勇气和力量深深地鼓舞了托德上士，这又让他想起了“阿甘马拉松”，他觉得可以把马拉松当做为受伤的退伍军人筹集捐款的办法。
Inspired by the courage and strength of amputees like Marine Ormrod, Colour Sgt Todd revived the idea of the Gumpathon as a way to raise money for wounded veterans.
达尔文乘坐小猎犬号勘察船，在去另一个遥远的火山岛-圣赫勒拿岛途中造访了阿森松岛，当时并没有多大期望能发现什么。
Aboard HMS Beagle, he called in at Ascension. En route from another remote volcanic island, St Helena, Darwin wasn't expecting much.
英国BBC详细叙述了查尔斯·达尔文如何帮助在阿森松岛上建立了一片人工林，这个岛屿是达尔文乘坐英国皇家海军“小猎犬号”进行科学考察过程中的一个考察对象。
The BBC recounts how Charles Darwin helped build an artificial forest on Ascension Island, one of his subjects of study from his trips on the HMS Beagle.
虽然远未得到证实，但存在一种可能，就是阿森松岛正在受益于全球变暖的趋势。
One possibility, far from proved, is that Ascension is benefiting from global warming.
虽然在过去的30年间阿森松岛上的温度并没有明显变化，但该岛上风向的洋面温度在上世纪80年代跃升了1度以上，在那之后洋面温度趋于稳定。
Although the temperature on Ascension has not changed appreciably in the past 30 years, sea-surface temperatures upwind of it jumped by more than a degree in the 1980s before levelling off.
阿森松岛——查尔斯·达尔文当年种的人造林从飘过阿森松岛(ascension Island)上的火山峰顶的云中吸收水分。
Ascension Island Charles Darwin's artificial forest captures moisture from clouds that drift over the volcanic peaks on Ascension Island. Google earth.
一年一度的纽约马拉松赛于上周日举行，“阿汤嫂”凯蒂·赫尔姆斯也出现在数万人的参赛队伍中，她以5小时29分48秒跑完了比赛全程。
Holmes was among the tens of thousands of runners participating in the annual New York City Marathon on Sunday, finishing the race in 5 hours, 29 minutes and 58 seconds.
一年一度的纽约马拉松赛于上周日举行，“阿汤嫂”凯蒂·赫尔姆斯也出现在数万人的参赛队伍中，她以5小时29分48秒跑完了比赛全程。
Holmes was among the tens of thousands of runners participating in the annual New York City Marathon on Sunday, finishing the race in 5 hours, 29 minutes and 58 seconds.
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