The main structure is made of pine logs, like many traditional structures in Finland.

主要结构是松树原木，像在芬兰许多传统的结构一样。

youdao

Yet noble intentions do not, of themselves, move concrete, even rotting concrete like the cement-and-pine-cone slurry used to make the Elwha Dam, the first of the two structures to be built.

ECONOMIST: Water in the West (2)