incommutable

an incommutable death sentence.

不能更改死刑判

a rare, incommutable skill.

、千金不换技艺

The time-varying and incommutable character of the coefficient matrix of periodically time-varying linear systems are the bottleneck of the design for high precision direct integration methods.

周变线性系统系数矩变性与不可交换性是其精细积分算法设计中瓶颈。