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匿名	关注：1 2013-05-23 12:21 求翻译：he researchers returned 2 weeks later and observed how much graffiti had been written since they posted the signs.是什么意思？待解决悬赏分：1 - 离问题结束还有 he researchers returned 2 weeks later and observed how much graffiti had been written since they posted the signs. 问题补充：

匿名	2013-05-23 12:21:38 正在翻译，请等待...

匿名	2013-05-23 12:23:18 正在翻译，请等待...

匿名	2013-05-23 12:24:58 他研究员2个星期以后退回并且观察了多少街道画被写了，自从他们张贴了标志。

匿名	2013-05-23 12:26:38 他研究人员如何观察 2 周后又很多涂鸦已写了因为他们张贴了标语。

匿名	2013-05-23 12:28:18 正在翻译，请等待...

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求翻译：he researchers returned 2 weeks later and observed how much graffiti had been written since they posted the signs.是什么意思？