They understand that people may have to be realistic and make down-to-earth decisions.
他们了解到，有时人们不得不变的现实一点，不得不做一些务实的抉择。
Faults are analyzed by means of an improved fault tree analysis, and several fault trees are built for every kind of faults, then make down-way quantity analysis with the minimal cut set theory.
采用一种改进的故障树分析方法对所得到的故障进行分析，根据每类故障分别建造了多棵故障树，并以最小割集理论按下行法对各树进行了定量分析。
Faults are analyzed by means of an improved fault tree analysis, and several fault trees are built for every kind of faults, then make down-way quantity analysis with the minimal cut set theory.
采用一种改进的故障树分析方法对所得到的故障进行分析，根据每类故障分别建造了多棵故障树，并以最小割集理论按下行法对各树进行了定量分析。
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