packet filtering

• 包过滤

packet filtering的用法和样例：

例句

1. Most commercial routers have some kind of built-in packet filtering capability.
   多数商品化的路由器都有某种内建的包过滤功能。
2. With packet filtering, you have access to deliver the package yourself.
   使用包过滤时，你自己来送交此小数据包。