目录各种项目的列表或集合 A list or collection of various items.
由系统中等待服务的项目构成的行或列表，例如等待执行的任务或在报文路由选择系统中等待发送的报文。 A line or list formed by items in a system waiting for service; for example, tasks to be performed or messages to be transmitted in a message routing system.