The number of people in prison for drug offences has trebled since 1994.
1994年以来,在押毒犯数量已经增长了3倍.
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When the price of oil hit the sky last year, Mr Wright's operating costs nearly trebled.
当去年石油价格涨到天高的时候, 莱特先生的经营成本也翻了三倍.
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The United States Air Force was going to be doubled, or perhaps trebled, in the next six months.
在未来的六个月中,美国将把它的空军增加一倍或两倍。
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