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2013-05-23 12:21
求翻译：The durability of concrete can be defined as its resistance to deterioration resulting from external and internal causes. The external causes include the effects of environmental and service conditions to which concrete is subjected，such as weathering，chemical actions and wear.是什么意思？ 待解决
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The durability of concrete can be defined as its resistance to deterioration resulting from external and internal causes. The external causes include the effects of environmental and service conditions to which concrete is subjected，such as weathering，chemical actions and wear.
问题补充： |
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