这个合约通常会比较明确的定义所 谓每个 危险单位 （ Per Risk ），譬如火灾保险里的每一 Risk 会 定义为：A risk is one building including contents thereine and
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return per unit risk 单位风险收益
return per unit of risk 单位风险收益
expected return per unit risk 单位风险期望收益
And the greatest risk reductions were in those who took more than fourteen aspirins per week.
VOA: special.2009.09.01
The study found that the people who ate five or more servings of white rice per week had a seventeen percent increased risk of developing type two diabetes.
VOA: special.2010.06.30
In contrast, those who ate two or more servings of brown rice per week had an 11 percent reduced risk.
VOA: standard.2010.06.25
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