1. A cat can retract its claws. 
   猫能缩回爪子。
2. To recant or retract something sworn. 
   食言取消或撤回所发的誓
3. Knowing what port an address is on allows the switch to limit packets bound for that address to that port. 
   知道了地址在哪个端口上，就能使交换机把送到那个地址的包只限在那个端口上。
4. New LAN switch features, such as IP Multicase "snooping" techniques can limit the effects of multimedia multicast and broadcast traffic flooding the entire network. 
   lan交换机的新功能，如ip多波“探听”技术，能对多媒体多播和广播流量在整个网络中泛滥的影响加以限制。
5. To retract(something spoken); unsay. 
   收回（所说的某些话）；撤回（前言）

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