We assume that these parameters are random in the future, and that they follow an multivariate normal distribution around in the future, and that they follow an multivariate normal distribution around their expected values, and their deviations, although random, are small such that linear approximation of these measures(voltage magnitude, branch flow, and loadability)with respect to these parameters is valid.

我们假定这些参数在将来是随机的，在将来它们会遵循多变量正态分布，它们会围绕着它们的预期值成多元正态分布，它们的偏离虽然是随机的，但很小，从而使这些测量（电压，分支电流和负荷能力）的线性近似值就这些参数而言是有效的，

我们假设这些参数在将来会随机出现，并围绕其期望值呈多元正态分布，尽管它们有很小偏差且随机，从而我们测定特定性能指数（电压等级、分支电流和载荷能力）的线性近似值对于这些随机参数是有效的。