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Who said concrete bridges are dull?
谁说混凝土桥梁是沉闷的?
And you can see that it comes up again when we 3D-print concrete bridges.
当我们 3D 打印混凝土桥梁时,您会看到它再次出现。
Concrete bridges only started to appear widely in the early 20th century. Early examples include:
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