threefold
adjective uk/ˈθriː.fəʊld/ us/ˈθriː.foʊld/
三倍的
three times as big or as much
a threefold increase 三倍的增长
有三部分的
having three parts
a threefold classifcation 三部分的分类法
threefold
adverb uk/ˈθriː.fəʊld/ us/ˈθriː.foʊld/
（以）三倍（地）
by three times
Prices have risen threefold. 价格上涨了三倍。