1. The permutation is even if the number of in versions it contains is even. 如果一个排列中含有的反序的个数是偶数，则称它为偶排列。
2. The block cipher with a substitution permutation network is the best known and widely used block cipher system. 包含代替置换网络的分组密码是一种广泛使用的分组密码系统。
3. To present a new application of permutation entropy method for automatic brain consciousness task classification. 研究基于脑电信号排列组合熵的运动意识任务自动分类方法。
英英解释
n.
1. an event in which one thing is substituted for another
2. the act of changing the arrangement of a given number of elements
3. complete change in character or condition
4. act of changing the lineal order of objects in a group
