“世界幸福数据库”的专家调查了不同国家的快乐程度。

The authorities at the World Database on Happiness have surveyed levels of happiness in different countries.

youdao

“世界幸福数据库”的专家调查了不同国家的快乐程度。

The authorities at the World Database on Happiness have surveyed levels of happiness in different countries.

youdao