Indicating a comparison or ratio 表示相比或比率
The lower the ratio, the stronger that silver prices become in comparison to gold.
这个比例越低，银价就比金价更强势。
Humanity's main fuel for eons was wood, which has a carbon-to-hydrogen ratio of 10 to 1 when burned; by comparison, that ratio is 2 to 1 for coal and 1 to 2 for oil.
千万年以来，人类的主要燃料是木头，燃烧木头的过程中，碳和氢的比率是10比1。相比较而言，煤在燃烧过程中这个比率是2比1，而石油的比率则是1比2。
Obesity is calculated using the Body Mass Index (BMI), a ratio of weight in comparison to height.
肥胖程度是以身体质量指数(BMI)来衡量的，身体质量指数即体重与身高的比。
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