This is the so-called demographic timebomb, which means there will be increasing numbers of pensioners in coming decades and fewer workers to support and look after them.
BBC: Should wealthy pensioners get benefits?
And a demographic timebomb is ticking.
ECONOMIST: Productivity growth
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。