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What's the difference between ratio and rate?

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What's the difference between ratio and rate?
两者的具体用法区分在哪里呢?
What's the difference between ratio and rate?
【例子1】
Rate是率,速率啊什么的.抄了百度两个句子.The car was going at the rate of 60 miles an hour.The unemployment rate is rising in that country.Ratio是比,就是数学上的那个.The ratio of 15 to 5 is 3 to 1.15：5=3：1
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【例子2】
Rate是率,速率at the rate of 以.的速度birth rate 出生率unemployment rate 失业率Ratio是比,数学上常用的比.The ratio of 15 to 5 is 3 to 1.15：5=3：1
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【例子3】
rate是百分比的意思 比率ratio是比例 几比几例如：The maternal mortality rate is 6% in this region.这个地区母亲的死亡率是百分之6.The Ratio of 50 and 30 is 5:3.50比上30等于5比3.
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【例子4】
ratio指“比率”,通常强调某个部分在一大个整体中所占的地位,一般是通过与其对立或者相关部分的比较而言,例如：The ratio of men to women in this department is very high.(这个部门中,男女比例很高）rate是使用最频繁的一个词,它可以指“速度”“率”例子：The can runs at an average rate of 100km per hour.(汽车以每小时100千米的平均速度行驶）（rate的这个意义就相当于speed)criminal rate/divorce rate/unemployment rate 犯罪率、离婚率、失业率（rate所指的“率”一般是就部分在整体中的地位而言,不涉及比较）
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