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The city has trebled the number of its prisoners to 21,000.該市的囚犯人數(shù)增長了兩倍，達(dá)到21,000人。Their profits have trebled in the last two years.最近兩年他們的利潤增加了三倍.It's value has trebled.它的價(jià)值已增長到原來的三倍....

trebled的音標(biāo)：...

v.（使）成三倍( treble的現(xiàn)在分詞 )...