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。

But for the remainder, the risk of cancer, while increased at the end of life, must be balanced with other factors like remaining life expectancy.

但在剩下的时间里，尽管癌症的风险在临终时增加，它必须与其他因素，如剩余寿命平衡。

The researchers conclude that electronic communication was the only adolescent activity that increased at the same time psychological wellbeing declined.

研究人员得出结论，电子交流是青少年唯一一项在心理健康下降的同时增加的活动。

The prevalence has increased at an alarming rate.

肥胖症流行率以惊人的速度增长。

Neither the number of its producers nor their output can be increased at will.

无论是生产者还是产品的数量都不能随意增加。