n.交换；排列
The combining roulette wheel with optimization selection is used.A position-based and group permutation crossover method and random mutation are introduced. 采用轮盘赌与最优性相结合的方法进行选择，设计基于位置成组移位的杂交算子和随机交换的变异算子。
Such a permutation is called a derangement. 这样的一个排列称为错位排列。
Unique because that particular permutation has not appeared before. 之所以独一无二，是因为那种独特的基因排列组合以前不曾出现过。
置换
n.高变
