英语翻译Normally,an arc in an influence diagram denotes an influ

英语翻译
Normally,an arc in an influence diagram denotes an influence,i.e.,the fact that the node at the tail of the arc influences the value (or the probability distribution over the possible values) of the node at the head of the arc.Some arcs in influence diagrams have clearly a causal meaning.In particular,a directed path from a decision node to a chance node means that the decision (i.e.,a manipulation of the graph) will impact that chance node in the sense of changing its probability distribution.