After the rules are built and chains are in place, the real work of packet filtering starts.
建立规则并将链放在适当的位置之后，就可以开始进行真正的信息包过滤工作了。
These three chains are the main chains built-in by default inside basic packet-filtering tables.
这三个链是基本信息包过滤表中内置的缺省主链。
Heavy Series chains, also built in accordance with ANSI B29.1, are designed using link plate material from the next larger size chain.
重型系列链，也是根据ANSI B29.1筹建的，旨在利用下一个较大的尺寸链链板材料。
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