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关注：1
2013-05-23 12:21
求翻译：But improvements were still needed: several important problems were associated with working with compressed air, because the entire tunnel had to be maintained under pressure. Those problems were mainly related to:是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
But improvements were still needed: several important problems were associated with working with compressed air, because the entire tunnel had to be maintained under pressure. Those problems were mainly related to:
问题补充： |
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2013-05-23 12:21:38
但仍需要改进：用压缩空气工作有关联的几个重要问题，因为整个隧道必须保持在压力下。这些问题主要涉及：
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2013-05-23 12:23:18
但是改善仍然必要：因为整个隧道必须被维护在压力下，几个重要问题同与压缩空气一起使用联系在一起。那些问题主要与有关：
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2013-05-23 12:24:58
但改善仍然必要： 因为整个隧道必须被维护在压力下，几个重要问题同与压缩空气一起使用联系在一起。 那些问题主要与有关：
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2013-05-23 12:26:38
但仍需要改进： 几个重要问题是与压缩空气，与工作相关联，因为整个隧道也必须保持在压力下。这些问题主要涉及到：
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2013-05-23 12:28:18
但仍需要改善:一些重要的问题与使用压缩空气,因为整个隧道必须保持在压力下工作。 这些问题主要涉及到:
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