一旦必需的SIL确定，该标准就可以提供目标风险降低因数（Risk Reduction Factor，RRF）和目标平均PFD，从而量化了SIS的设计标准。
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risk reduction factor
风险降低系数
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It should not be about risk factor reduction and fear of dying, but about joy of living and feeling better.
FORBES: Magazine Article
According to the experts, some other factor could be responsible for the reduction in cancer risk.
CNN: Study: Aspirin, ibuprofen may cut breast cancer risk
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