You use quadruple to indicate that something has four parts or happens four times.
The quadruple murder has replaced property prices as the sole topic of interest.
这起四尸连环谋杀案已经取代房价成为了人们惟一感兴趣的话题。
If one amount is quadruple another amount, it is four times bigger.
Fifty-nine per cent of its residents have attended graduate school – quadruple the national average.
该地区59%的居民读过研究生–是全国平均水平的4倍。
quadruples , quadrupling , quadrupled
If someone quadruples an amount or if it quadruples, it becomes four times bigger.
China seeks to quadruple its income in twenty years.
中国力求在20年内将其收入翻两番。