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.

哈佛大学和哥伦比亚大学的学者们进行的“黄金标准”研究发现，即便是在极度贫困的学校，教师也始终会产生巨大的，或积极或消极的影响。

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Similarly, using standard formats such as XML is a great idea for data interchange but can have a negative impact on performance if your application performs repeated or extraneous transformations.

类似地，使用xml之类的标准格式对数据交换非常有益，但是如果应用程序执行重复的或过量的转换，那么这样做将对性能造成负面影响。

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As I've been getting a lot of negative feedback from the employees that the standard of service and quality of the food has been getting worse.

因为我从雇员那里得到很多负面反馈。说服务的标准和食品质量越来越差了。

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Joerg Kraemer, chief economist at Commerzbank -- Germany's second-largest bank -- would expect the ECB to cut the deposit rate to negative territory before putting in place any other non-standard measures such as a loan scheme for small businesses.

CNN: Euro recession deepens: So what can the ECB do now?

Stephen Green of Standard Chartered thinks export growth could fall to zero next year and even turn negative.

FORBES: Magazine Article

Standard Keynesian models that claim a quick boost from higher government spending show the effect quickly turns negative.

WSJ: Michael Boskin: Larger Spending Cuts Would Help the Economy