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Barefoot squat, weightlifting squat should also be OK?板栗问道：你还有什么事？大苞谷道：我还有些赌债没收呢。If the message has been matched by the previous rule, iptables performs the corresponding action on the message, Even the latter rules match the current message, It is very likely that there will be no chance to perform corresponding actions on the message again. Take the above figure as an example, the message is first matched by the first rule, so the current message is "released", because the message has already been released, so even if the second rule in the above figure can match the message just "released", there is no chance to discard the message just now. This is how iptables works.The Source class is a decorated class, and the Decorator class is a decorated class. You can dynamically add some functions to the Source class. The code is as follows: