The systematic failure probability of flood-control system is difficult to evaluate because there is much difference among the risks of components of the system.
由于防洪体系组成部分的风险程度各异，综合的系统失事率难以评估。
The systematic failure probability of flood-control system is difficult to evaluate because there is much difference among the risks of components of the system.
由于防洪体系组成部分的风险程度各异，综合的系统失事率难以评估。
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