undo the ties of; "They untied the prisoner" 同义词：untie, unlace,
例句与用法
1.
He unbraced successively each of six minus one braced trouser buttons , arranged in pairs , of which one incomplete 长裤的背带上钉着成双的六颗纽扣其中缺了一颗，他依次解开那六颗其中少了一颗纽扣。
2.
In order to take the influence of the internal force from translation into consideration , the design of in - plane buckling of unbraced frames adopted a new second - order elastic method to calculate the structural internal force , e . g . the imaginary horizontal loads method 为考虑变形对内力的影响，对无支撑框架的平面内稳定计算提出采用假想水平荷载法进行二阶弹性内力分析，以与国际上钢结构设计相接轨。
3.
This article would analyze the two method farther in the background theory and calculate kinds of the examples of the pure unbraced frames with the effect of initial defect . at one time the same instances were analyzed by the finite element numeric method , which results were compared with the res ults of the three methods . the conclusions from the comparison would offer the references to the revision of the code 本文对这两种方法进行深入的研究，考虑部分初始缺陷的影响，对各种无支撑纯框架实例进行了大量计算分析，并采用有限元法进行对应分析作参考，对三种方法的计算结果进行比较，得出结论，以期对规范的修订提供依据。
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