In the case of the internal rate of return calculation, a net present value of zero is assumed, and the internal rate of return needed to produce this is computed.

在对内部收益率的计算中，净现值被设为零，要计算的是使净现值为零的内部收益率。

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To accommodate cash flow fluctuations, you can adjust the ROI calculation to include the net Present Value (NPV) of the net benefits divided by the NPV of the implementation costs.

要包含现金流的波动，可以调整roi计算，以包括净利益的净现值(Net Present Value, NPV)除以实现成本的NPV所得的值。

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The calculation value of land subsidence from 1969 to present agrees the measured value well.

从1969年至今的地面沉降实测值与计算值也相吻合。

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