There have been a lot of research in finding out the stories behind these giant structures but there hasn't been any concrete answer to this question.

曾经有人做了很多调查研究这些巨石背后的故事，但至今仍没有具体的结果。

youdao

Lochbaum notes that the spent fuel ponds for 23 U.S. reactors are in the attic of their concrete reactor buildings-structures that were blown away by the first two hydrogen explosions at fukushima.

Lochbaum指出供23个反应堆的乏燃料池在混凝土反应堆建筑的顶楼，这种建筑结构在辅导的前两次氢爆炸中被吹走了。

youdao

Doing experiments is an important method in the research of durability of concrete structures.

混凝土结构的耐久性试验是研究结构耐久性的重要手段。

youdao

His two European office projects - one in Dusseldorf and the other in Prague - feature glass and concrete structures turned at crazy angles (the Prague building has been nick-named Fred and Ginger, after the Hollywood dance couple).

BBC: Gehry: King of pop architecture

These are the rather ordinary steel bars that are used to reinforce concrete and masonry structures in construction projects.

FORBES: America's Hypocritical Move Toward China

The critical role of the structures essentially big pipes or concrete boxes carrying streams beneath roads was demonstrated dramatically in a series of extreme weather events hitting the Northeast in recent years.

WSJ: Towns, ecologists seek climate-friendly culverts