求翻译：5、 依据拓扑优化和尺寸改进对桥壳进行轻量化设计，并分析改进后桥壳的各项性能，结果显示，改进后桥壳减重10.5%的情况下，能够满足相应的技术强度要求是什么意思？

5 , according to the topology optimization and improvement of the axle housing size lightweight design , and analysis to improve the performance of the rear axle , the results show the improved axle weight under 10.5% of cases, the appropriate technology to meet the strength requirements

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5th, Carries on the lightweight design based on the topology optimization and the size improvement to the bridge shell, and analyzes the improvement rear axle housing each performance, finally demonstrated, the improvement rear axle housing reduces weight in 10.5% situations, can satisfy the corresp

5, based on topology optimization of lightweight design and size improvements on the axle, and improved performance on the axle, the results showed improved axle weight 10.5% of cases, can meet the requirements corresponding technical strength

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