该研究还提出了警示：对研究结果进行解读时要谨慎，因为调查是“自主选择的”——心情愉悦的参与者更愿意对调查内容作出回答。 而接受采访的人中只有一个人对血拼感到后悔。

The study did sound a cautionary note, saying that findings should be interpreted with care because the survey was 'self-selecting', because participants in a good mood were more likely to respond.

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