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关注：1
2013-05-23 12:21
求翻译：Having drug-using friends was significantly associated with increased concurrent heroin use. Longer length of treatment (2 years or longer) was associated with increased concurrent heroin use.是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
Having drug-using friends was significantly associated with increased concurrent heroin use. Longer length of treatment (2 years or longer) was associated with increased concurrent heroin use.
问题补充： |
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