And at a country level, trading block or the global market, costs are very important.

在国家层面，贸易壁垒或全球化的市场，成本非常重要。

So the amount of schooling that the average person gets in most societies is closely tied to the country’s level of economic development.

因此，在大多数社会中，普通人的受教育程度与国家的经济发展水平密切相关。

Ms. Prinzo says if the new guidelines are enforced at the country level, the chance of survival for children with severe acute malnutrition will be greatly improved.

Prinzo说如果新的指导方针能在国家层面得到实施，那么患有严重急性营养不良儿童的存活机会将大大增加。

And in every single year after 1974, the average has been less than two children meaning that Japan's births have been below the country's natural population replacement level for nearly half a century.

1974 年之后的每一年，日本的平均生育率都低于两个孩子，这意味着日本的出生率在近半个世纪里一直低于该国的自然人口更替水平。