When Was Concrete Invented
Title: “New：”
(When Was Concrete Invented)
Blog: When Was Concrete Invented? The New Era of Building!
Introduction
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Background
2030，Dr. Erwin。，、，、、。，··——。
Now we can think about how？··（University of göttingen）。1947，·，，。1961，，，。
Today,。，，，。、，。，，，。
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(When Was Concrete Invented)
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