adj.三倍的；三重的
adv.三倍地；三重地
The graphs show a threefold increase in the number of. 該圖表表明數(shù)目增長了三倍。
用作副詞 (adv.)The result: wood theft went up threefold. 結果是：樹木偷伐量增長了3倍。
In just over a year's time, membership has increased threefold. 在短短一年間，成員人數(shù)已增加三倍。
