The first one is the method of risk contribution tree, by which the risk of the basic event can be quantified and the components of the risk can be depicted in detail.
第一种方法是风险贡献树法，这种方法能够计算底事件的风险，比较细化，能够详尽的描述出系统的各个风险成分；
Event tree method is a common method of dam risk analysis.
事件树法是目前通用的一种大坝风险分析方法。
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