...局 限之处是它未能允许个体效应中可能存在的空间效应；KKP 模型的局限性在于它未能区别对待对个体的 永久性冲击(permanent shock)的空间溢出效应与对个体的暂时性冲击(transitory shock)的溢出效应。
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permanent shock
永久的冲击
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It takes a real, permanent shock to get any real effects, and suffice to say the American political system is unlikely to ever pass a gas tax high enough to drive these kinds of changes.
FORBES: Raising Gas Taxes Wouldn't Cut Consumption, But It Still Makes Sense
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