The Population Information Network (POPIN), A guide to population information on UN system web sites, was founded on 9 May 1979 by the United Nations Economic and Social Council.是什么意思_The Population Information Network (POPIN), A guide to population information on UN system web sites, was founded on 9 May 1979 by the United Nations Economic and Social Council.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句