第一层负责发现活动网络，轮询服务和设备是否出故障，以及截获或处理来自设备、服务或更高层分布式代理的异步事件。
It is responsible for active network discovery, polling for device outages and services, and intercepting or processing asynchronous events from devices, services, or higher level distributed agents.
IrLAP是负责IrDa设备发现、重传以及流控制的链路存取协议层。
IrLAP is the link accesses protocol layer responsible for IrDa device discovery, retransmission, and flow control.
过了几个星期后，发现所有设备都被闸盖上薄薄的一层灰土覆盖了，必须要铺上保护罩。
Within a few weeks, all the equipment was found to be covered in thick layers of brake dust and needed to be put into protective casing.
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