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关注：1
2013-05-23 12:21
求翻译：4. Do we use a chemical to make these negatives? What does this chemical cost and how much do we use in the negative making process是什么意思？ 待解决
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- 离问题结束还有
4. Do we use a chemical to make these negatives? What does this chemical cost and how much do we use in the negative making process
问题补充： |
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