在英语中ratio怎么用

在英语中ratio怎么用
就是某某和某某的比值,应该怎么说呢?

atio:[ 'reiʃiəu ]
n.比,比率
词形变化:
名词复数:ratios
例句与用法:
1.The ratio of schoolboys to schoolgirls is 2 to 1.
男学生和女学生的比例是2比1.
2.Men outnumber women here in the ratio of three to one.
此地男子数量以三比一超过女子.
3.The ratios of 1 to 5 and 20 to 100 are the same.
1与5之比和20与100之比相同.
4.The interval between any two frequencies having a ratio of2 to1.
倍频程频率比率为2比1的两个频率的间隔