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關注：1
2013-05-23 12:21
求翻譯：The main sources of human-produced sewage are land-based - such as municipal sewer是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
The main sources of human-produced sewage are land-based - such as municipal sewer
問題補充： |
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