please help me translate the following sentence into chinese.thanks a trillion!

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Depending on how uncertainty enters the model, there can be cases
in which the number of shares of stock a hedge should hold is not the (calculus) derivative of the
derivative security with respect to the price of the underlying asset.

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关键词：translate following Sentence Trillion Chinese Chinese please Sentence following Trillion

可能存在某些情况：一个对冲（头寸或组合）所持有的股票份额数量，并不等于对衍生证券的标的资产价值求微分——这取决于模型引入的不确定项有多少。

[此贴子已经被作者于2008-2-14 0:22:33编辑过]

simply it means: the delta netural strategy may fail due to the unusual way that uncertainty enters the model.

But my question is: what are those uncertainties? what's been depended on? any contexts? 
Thanks

以下是引用warecucff在2008-2-15 0:50:00的发言：
simply it means: the delta netural strategy may fail due to the unusual way that uncertainty enters the model.

But my question is: what are those uncertainties? what's been depended on? any contexts? 
Thanks

对，楼主不妨说说有哪些不确定性。