"a fourfold increase in the dosage"
"the price of gasoline has increased fourfold over the past two years"
同义词： four times
以上来源于: WordNet
ADJ equal to or having four times as many or as much 四倍的
ADV by or up to four times as many or as much 四倍地
Beef production has fallen nearly fourfold.
牛肉的生产也降了近四倍。
THE amount of plastic thrown away by Americans increased fourfold between 1980 and 2008.
从1980年到2008年，美国人丢弃的塑料的量翻了四番。
One example is the fourfold increase in alcohol-related deaths that occurred between 1991 and 2002.
其中一个例子就是，1991至2002年间，与酒精相关的死亡增长了三倍。
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