The second command simply deletes rule number 3 from the OUTPUT chain.
第二条命令只是从OUT put链删除编号为3的规则。
Rules dealing with outgoing packets are added to the OUTPUT chain.
处理出站信息包的规则被添加到OUT put链中。
There is actually a chain of certificates, as you can deduct from the output underneath "certificate chain".
根据“certificate chain”下面的输出可以推断出，实际上有一个证书链。
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