However, the definition of the mutual information between a pair X, Y of random variables (or vectors) can be generalized to the nondiscrete case in a much more interesting and useful way.

• 而在一对离散随机变量(或矢量)X和Y之间定义的互信息量，却可以按照一种更有趣和更实用的方式推广到非离散的情形；