BFS Ordering tree 点为根的树
simple tree partial ordering 简单树半序
a simple tree semi-ordering 简单树半序
linear ordering for tree 树的线性次序
This paper studies the variable ordering of Phased Mission System (PMS) fault tree.
研究阶段任务系统(PMS)故障树变量排序方法。
Allergens are very easy to avoid when ordering Chinese food: dairy is not used at all, wheat is very rare and tree nuts are always called out explicitly.
点中餐可以很容易地避免过敏：菜品里完全不用乳制品，小麦很少用，坚果也会被明确标出。
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