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关注：1
2013-05-23 12:21
求翻译：自十九世纪以来，钢筋和水泥成为现代建筑材料中重要的两种是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
自十九世纪以来，钢筋和水泥成为现代建筑材料中重要的两种
问题补充： |
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2013-05-23 12:21:38
Two modern building materials since the nineteenth century, steel and cement
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2013-05-23 12:23:18
Since the 19th Century, steel and concrete as a modern building materials in the two important
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2013-05-23 12:24:58
正在翻译，请等待...
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2013-05-23 12:26:38
Since 19th century, steel became important modern building materials and cement the two
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2013-05-23 12:28:18
正在翻译，请等待...
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