什么定义为在树中打开一个节点?

What is defined as opening a node in a tree?

我正在为作业的 A 星遍历画一棵树。我对 "opening" 节点的确切定义有些困惑。是为了看它的children吗?或者它是否也包括我正在为其计算成本的叶节点?

在breadth-first搜索中,这是否也包括叶节点?或者只是我打开的那些 children?

Is it when I do it to see its children?

是的,"opening"或"expanding"一个节点就是这个意思,"let's see what are its children nodes"。