"率"在英语中表示为 "rate"，表示比率或速度。它来源于拉丁语 "ratio"，意为比例。
例句：
The failure rate of the new product is unacceptably high. (新产品的失败率过高，不能接受。)
The interest rate on this loan is 5%. (这笔贷款的利率是5%。)
The exchange rate between the US dollar and the Euro is constantly changing. (美元和欧元之间的汇率不断变化。)