translation.en: The Economist magazine recently wrote an article covering one of the recent studies on happiness, and the title was "The Happy, the Unhappy and the Bulgarians."
translation.zh: 经济学人杂志最近刊登了一篇文章 是关于最近的一次对“幸福”的研究报告 文章名称是“幸福，不幸福，以及保加利亚人”