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关注：1
2013-05-23 12:21
求翻译：必须保护空气免受污染是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
必须保护空气免受污染
问题补充： |
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2013-05-23 12:21:38
Air must be protected from contamination
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2013-05-23 12:23:18
We must safeguard the air from pollution
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2013-05-23 12:24:58
Must protect the air to exempt is polluted
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2013-05-23 12:26:38
The air must be protected against pollution
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2013-05-23 12:28:18
Must protect air against the pollution
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