C146 When the Siblings Saw Each Other They Were Shocked

After receiving this simple firewall, a few moments later, the classroom was filled with exclamations.

"F * ck! How did this firewall work? I actually don't understand!"

"Yeah, it's so complicated. It feels like this editor's program is much more powerful than the virus Trojan Horse!"

"Yeah, this is a simplified version. If it was a complete version