“dependency ratio”造句，怎麼用dependency ratio造句

Rich countries have captured the easy gains from land use and education. Rising dependency ratios are starting to weigh on growth.

China's one-child policy will keep birth rates low, but as life expectancy continues to increase, so will the dependency ratio, reducing the country's potential for growth.

Compared with America, even the growing parts of the continent have modest fertility rates and high dependency ratios.

Applying the methodology of standardized crude rate is necessary to remove the impact of the age structure so that the standardized dependency ratio and demographic dividend can reflect the reality.

When fertility is high and a country is young (median age below 20), there are huge numbers of children and the overall dependency ratio is high.