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 。
youdao
It is not really so much about risk-factor reduction or preventing something bad from happening.
这不是真的那么多关于于致病风险因素的减少或阻止一些不好的情况。
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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