Officials say the rate has tripled in teenagers and doubled in younger children since nineteen eighty.

VOA: special.2010.06.07

John, let me give you one more, one other statistic During the last 7 years, the Bush presidency household debt has almost tripled.

约翰，我再给你一项数据,布什上台后的这7年里,家庭债务翻了三番。

斯坦福公开课 - 经济学课程节选

they're having their rents, commercial rents tripled, not even doubled.

他们要付租金，商品房租金翻了三倍，而不只是两倍。

纽约的负面变化 - SpeakingMax英语口语达人

But his big breakthrough came later, breeding high-yielding wheat varieties that more than tripled the harvest.

VOA: standard.2009.09.16

Data shows the rate of childhood obesity has tripled over the last 30 years.

VOA: standard.2010.03.09