这些实体也是规范的一部分，形成了在线路层协议顶端的一个层级：AMQP模型。
These entities are also part of the specification and form a layer on top of the wire level protocol: the AMQP model.
在线测试是通过观察线路上双方协议实体的会话来进行协议测试的方法，测试中需要判定会话双方的状态。
The online test is to test protocol through the protocol session observed online and the states of the session partners needed to be determined.
通过分析大城市公共交通线路及站点的实际状况论证了详细的公交实体表达的必要性。
The need for detailed representation of public transport features is illustrated by cases existing in large cities.
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