Key difference is the height of the arch.

关键区别是曲拱的高度。

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Stability calculation is the key problem of the arch structure design.

稳定性计算是拱结构设计中一个关键课题。

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Stability calculation is the key problem of the arch structure design.

稳定性计算是拱结构设计中一个关键课题。

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