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1·He trebled his earnings in two years.

他在两年间收入增加了两倍。《牛津词典》

2·Cases of food poisoning have trebled in the last two years.

在过去的两年里，食物中毒事件增加了两倍。《牛津词典》

3·My rent trebled last month.

上个月，我的房租涨了两倍。

4·The newspaper's circulation has trebled since last year.

去年以来该报的发行量已增加到原来的叁倍。

5·Profits in our company have trebled in the last two years.

我们公司的利润在这两年中增长成以前的三倍。

6·By 2050, if nothing changes, that number will have trebled.

如果情况没有改变，那么到了2050年这个数字将会翻3倍。

7·Sales of earplugs have trebled due to the World Cup outside stadiums.

世界杯开赛以来，赛场外耳塞的销量增长了两倍。

8·But no one knows for sure why America's obesity has trebled since 1960.

但是没有人能确切的知道为何美国的肥胖率自1960年开始猛增了3倍。

9·The efficiency of these machines has been more than trebled or quadrupled.

这些机器的效率已提高了两倍或三倍多。

10·In rich countries the proportion of births outside marriage has trebled since 1980, to 33%.

在富裕国家，婚外生育比例是1980年的三倍，达到了33%。