一些发达国家，如美国，正在运行的即付即用即付(现收现付)系统，该系统主要用在有工作力支付的退休人员。

Some developed countries, such as United States, are running the Pay-As-You-Go (PAYG) system which the existing working force pays for the retirees.

youdao

一些发达国家，如美国，正在运行的即付即用即付(现收现付)系统，该系统主要用在有工作力支付的退休人员。

Some developed countries, such as United States, are running the Pay-As-You-Go (PAYG) system which the existing working force pays for the retirees.

youdao