As the load action on the roof of a structure and the propagation of the stress waves in soil cover are interdependent, the structure-medium interaction must be considered.

土中结构顶部的荷载与复土层中应力波的传播相关联。因此，必须考虑结构-介质的相互作用。

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They will record plant species, forest structure, ash cover, soil properties, river sediment and the overall topography of the burned area.

ECONOMIST: A 30-year plan to study America��s ecology is about to begin