幸福是一种选择：关于幸福的12个有趣真相

The happiest countries in the world are all in Northern Europe
世界上最幸福的国家都在北欧

The happiest countries in the world namely Denmark, Norway, Finland, and Netherlands are all in Northern Europe. Their average life evaluation score is 7.6 on a scale from 0 to 10.
世界上最幸福的国家有丹麦、挪威、芬兰和荷兰，这些都是北欧国家。在0-10分范围内，这些国家的平均生活评估得分是7.6分。