double (可以作形容词、名词或者动词) 两倍/翻倍

The company profits doubled in 1998.

这家公司在1998年寿一番。

近义：be twice as many as... 两倍于…

The number of consumer complaints in 2005 was twice as many as that in 2001.

2005年中顾客投诉的数量是2001年数量的两倍。

联想：be three times as many as... / be four times as many as...