trebled

例句:

• The city has trebled the number of its prisoners to 21,000.
  该市的囚犯人数增长了两倍，达到21,000人。
  
• Their profits have trebled in the last two years.
  最近两年他们的利润增加了三倍.
  
• It's value has trebled.
  它的价值已增长到原来的三倍.
  
• Last year the average waiting time trebled to six minutes.
  来自THETIMES
• In the same period, fatalities per kilometre covered almost trebled.
  来自THETIMES
• Old Masters have trebled in value over five years and have held their rise.
  来自WSJ