To add an additional IP alias to an Ethernet card that's already configured, you configure an interface with the same physical unit number but qualify it with a logical unit number.
要想在已经配置的以太网卡上添加额外的ip别名，应该为一个接口配置同样的物理单元号，但是要用一个逻辑单元号来限定它。
Design and implementation of sensor node which is the physical unit of WSNs is one of the key issues in WSNs.
作为无线传感器网络物理载体的传感器节点的设计与实现是无线传感器网络的关键问题之一。
"Shipping unit" means any physical unit of cargo not shipped in a package, including machinery, vehicles and boats, except goods shipped in bulk.
是指未以包件运输的任何一个具体单位的货物，包括机械、车辆及船只，但散装货物除外。
"Shipping unit" means any physical unit of cargo not shipped in a package, including machinery, vehicles and boats, except goods shipped in bulk.
是指未以包件运输的任何一个具体单位的货物，包括机械、车辆及船只，但散装货物除外。
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