由于关联只定义元素间的通讯关系，它执行的上下文(换句话说，输入的实际参数)就十分重要了。
As a relation defines only correspondence relationships between elements, the context in which it is executed (in other words, the actual parameters that are input) is very important.
针对P 2p组通讯的特点，定义了根跳距和根距离两个拓扑特征指标参数来衡量测试拓扑图和底层网络的吻合程度。
In the light of the characteristics of P2P group communication, we define two graph metrics, RH and RD, to quantify the matching degree between the overlay and the underlay network.
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