A measure of risk removed, i.e., the reduction of variance of key project metrics.

去除的风险测量，即，减少关键项目度量标准的方差。

youdao

It was recommended that school safety plan should be firmly adopted as an important disaster risk reduction measure in order to keep the children and community safe in case of floods, earthquake, tsunami and other natural disasters.

UNESCO: EDUCATION

And the best risk-reduction measure by far the decision not to mount warheads on missiles or load bombs into aircraft is always the first to be abandoned in a crisis.

ECONOMIST: It's worse than you thought