utilization ratio利用率；实用比 noise ratio噪声比 compression ratio n.压缩比 molar ratio n.摩尔比率，摩尔浓度；克分子比，克分子比率
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高考
四级
六级
1、 The adult to child ratio is one to six.
成人与儿童之比是1比6。
来源:秒词邦搜集整理
2、 The school has a very high teacher-student ratio.
这所学校的师生比例很高。
来源:《牛津词典》
1、 enjoy incomes that are on average 295 times that of the typical worker, a much higher ratio than in the past, without any evidence of a proportionate increase in productivity.
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