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关注：1
2013-05-23 12:21
求翻译：Several threats challenge the validity of our within-student strategy. Computer purchases may correlate with broader changes in family circumstances, or may be directly responsive to revealed information about student performance. If families tend to buy computers following positive shocks to income, we run the risk是什么意思？ 待解决
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Several threats challenge the validity of our within-student strategy. Computer purchases may correlate with broader changes in family circumstances, or may be directly responsive to revealed information about student performance. If families tend to buy computers following positive shocks to income, we run the risk
问题补充： |
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