Five years later , travel spending had increased fourfold .

然而五年以后，差旅费用增长了四倍。

Beef production has fallen nearly fourfold .

牛肉的生产也降了近四倍。

Lynas shares have risen fourfold since china announced the quota cuts in july 2010 .

lynas的股价自2010年7月中国宣布削减配额以来涨了四倍。

Oil now accounts for 12 % of brazil 's gdp , a fourfold increase since 1997 .

目前石油占巴西gdp百分之十二，1997年增加了四倍。

Hedge funds now manage $ 2.2 trillion in assets , up fourfold since 2000 .

对冲基金现在掌控的资产总量是2.2万亿美元，比2000年总值多了四倍。