But there is no the analytical solution for the American look-back option because of the complication of the initial and boundary conditions,so the characters for the solution of the American look-back option is blank.
但是由于美式回望期权初、边值条件的复杂性,至今无法求出其解析解,对其解析解的性质研究也甚少。
参考来源 - 美式回望期权同伦近似解的研究 （研究生论文）·2,447,543篇论文数据，部分数据来源于NoteExpress
以上来源于: WordNet
Meanwhile, Chris Smalling is beginning to make the right-back spot look like a natural option for him when he can't play his normal role in the center of defense.
与此同时，斯莫林在右后卫位置上的异军突起，令他无法正常发挥其在后防线中的作用。
He said: "I will look at the option of recalling some loan players. People like Jay Emanuel-Thomas, Kyle Bartley and Henri Lansbury could come back."
他说：“我将会看看是否会召回一些外租球员，比如JET，巴特利，兰斯布里可能回来。
There is no other option for it for Indolence is beyond our tolerance. Look at the winner of Waterloo Battle –Duke Weldon, he will not go back home unless he completed all his work for the day.
这点毫无他法可予取代，我们无法容忍懒惰，滑铁卢之役的胜利者---威尔顿公爵，他除非处理完所有工作，否则决不回家！
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