Two of the three main factors are directly about happiness. The third (Ecological footprint) is regarded as sustainable happiness. i.e. whether a country could sustain its citizens without any outside help.

三个主要因素中的两个都直接与幸福相关。第三个（生态足迹）被认为是可持续幸福。例如，一个国家是否可以在不靠任何外界帮助的情况下维持其公民生活。

The idea is that if there was an incident which cut a country completely off from the outside world, or a country had to be completely self-sufficient, most of the developed world would be unable to do that (without losing a lot of its population first).

观点是，若突发事件导致一个国家与外部世界失去联系，或在不流失大量人口的前提下，大多数发达国家是做不到完全自给自足这一点的。

The reason for some high-income nations to score significantly below other nations is the ecological footprint left on the planet.

一些高收入国家的指数显著低于他国的原因在于生态足迹。

Mexicans and Canadians both appear to be happier than their US neighbour - most likely due to the country's ecological footprint.

据显示，墨西哥人和加拿大人都比他们的邻居美国人幸福，这主要归功于国家的生态足迹。

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