rate ratio

例句：

1. 1. The company's profit margin is a key indicator of its financial health.
   公司的利润边际是其财务状况的关键指标。
2. 2.The cost of living in this city is much higher than the national average.
   这个城市的生活费比全国平均水平高得多。
3. 3.The ratio of male to female students in our school is almost equal.
   我们学校男生和女生的比例几乎相等。