考虑到本文的目的，我们将使用上面列出的第一种和第二种模型的组合形式。

For the purpose of this article, we will be using a combination of the first and second models, listed above.

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回顾我们都在问，因为所有在这里我们没有什么功能分化得到的第二个积分积也可以，传统上，我们使用该积分第一种形式。

Recalling that since all we are asking here is what function did we differentiate to get the integrand the second integral could also be, Traditionally we use the first form of this integral.

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