four times as great or as numerous 四倍的 there has been a fourfold increase in break-ins. 非法进入事件增长了三倍。 ■having four parts or elements 有四部分的 fourfold symmetry. 四面对称。
adverb
by four times; to four times the number or amount 四倍地;成四倍地 the price of electricity rose fourfold. 电价涨到原来的四倍。