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关注：1
2013-05-23 12:21
求翻译：Have pipes and ducts been sealed into the walls through which they pass so as not to create recesses which are difficult to clean?是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
Have pipes and ducts been sealed into the walls through which they pass so as not to create recesses which are difficult to clean?
问题补充： |
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