containment GRE四级六级

It is known that poset theory is important to the study on greedoid theory.But what is the direct relation between poset theory and the containment relations between different kinds of greedoids?

众所周知,偏序集理论在研究广义拟阵论中起着重要作用.但是偏序集理论与不同种广义拟阵间包含关系直接联系是什么呢?

We surmise that containment shifts development from exurban and rural areas to suburban and urban ones because of containment boundaries.

因此我们推测，由于制边界存在，制措反而将发展从郊外转移到了郊区城市。

With consumers still cautious, retailers' results may largely reflect recent efforts at inventory management, cost containment and lowball profit expectations.

由于消费者依然保持谨慎，零售商业绩在很大程度上可能反映了近期在库存管理、成本控制方面努力较低收益预期。