... 木材保存 wood preservation 木材保存剂 timber preservatives 全国档案保存处 National Archives ...
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If the steel is in direct contact with timber decking; timber retains moisture and may have been treated with corrosive preservatives.
如果钢材直接接触木桥面，木材保有水分，并可能已被防腐剂处理。
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