Previous research suggests that American drug sentiment is becoming more liberal. However, the absence of a reliable and valid over time measure limits our understanding of changes in drug attitude...

中文翻译：

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日益自由化：公众对毒品情绪的时间序列分析


此前的研究表明，美国的毒品情绪正变得更加自由。然而，缺乏可靠且有效的长期衡量标准限制了我们对药物态度变化的理解......