Write function, the output graph traversal sequence.
编写函数，输出图的遍历序列。
When you use indices to traverse the values in a sequence, it is tricky to get the beginning and end of the traversal right.
使用索引来遍历一个序列中的值的时候，弄清楚遍历的开头和结尾很不容易。
An assembly sequence can be automatically generated by implementing the postorder traversal to this model.
通过对该结构的后序遍历，自动生成装配序列，能有效地描述装配体。
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