A flow meter in the potable water line feeds information to the control system which controls the pump speed to controlratio.
饮用水管道中的流量计向控制系统传送信息，控制系统控制泵的速度以控制比率。
2
For example, China's regulator requires Banks to keep 17% of their deposits with the central bank and tinkers with this ratio to control the economy.
例如，中国的监管机构要求银行将17%的存款存到中央银行，通过摆弄这个比例来控制经济。
3
A study published in 2001 of 304 English professional soccer players found they had a significantly larger ring-to-index-finger ratio than a control group of 533 other men.