fixity

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The fixity of eye in all the combatants upon the extremity of the street became ferocious.
所有注视这街道尽头的目光都变得凶狠异常。
That may be why subsequent efforts to transfer the same fixity of purpose to broader spheres of peacetime endeavour have fallen short.
这或许就是为什么用同样的目标来探索更广阔空间的后续努力在和平时期打折扣的原因。
The fixity of the failed-states rankings from year to year reminds us that the multiple diseases that plague these places are very resistant to being cured, whether by domestic actors or outsiders.
失败国家的排名年复一年的保持不变，提醒我们，不管是由内部人员还是外部人员，折磨这些地区的多种疾病难以治愈。

Otherwise, it seems, the remaining course is to combine increasing integration with perfect fixity of exchange rates—meaning currency union.
ECONOMIST: One world, one money
One is the fixity of human nature, a principle dear to traditional conservatism.
FORBES: Paleogenomics Will Not Lead to Gatacca--If We're Vigilant
Knowledge emerges not from chaos, or fixity, but from conditions of uncertainty.
FORBES: Magazine Article

If you talk about the fixity of something, you talk about the fact that it does not change or weaken.