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。

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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。

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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。

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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.

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