What is the location and length of each wall section in the world?

什么是世界上的位置和长度在每一段长城？

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Finally, the critical length of the key wall is studied by means of FEM.

最后用有限单元法研究了齿坎的临界长度。

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Finally, the critical length of the key wall is studied by means of FEM.

最后用有限单元法研究了齿坎的临界长度。

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