upper lower bound estimate
upper lower bound estimate
上下界估计
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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An approximate formula using the lower and upper bound of the first simple bounds for estimate of the failure probability of structural systems is presented in the paper.
提出用一阶简单边界的上、下界来估计结构系统失效概率的近似公式。
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