Over the past century, human use of fresh water has increased at more than double the rate of population growth.
在过去的一个世纪里，人类对淡水的使用以超过人口增长率两倍的速度增长。
2
Over the past decade, prices leaped by more than double the inflation rate.
在过去的十年里，物价的上涨速度是通货膨胀率的两倍多。
3
One Gallup poll found that 20 percent of Americans, who have been unemployed for at least a year report having depression, double the rate for working Americans.