The gold standard study by Harvard and Columbia University scholars found that even in high-poverty schools, teachers consistently had a huge positive or negative impact.
other risk factors include living in high-crime neighborhoods, attending high-poverty schools and associating with troubled peers.
其它不良的因素包括：在高犯罪率区域生活、在极贫困的学校就读和与不良少年为伍。
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These children face huge obstacles, says James Comer of Yale University. Comer is a leading expert on child development and high-poverty schools like those in East Baltimore.