如果要重新阻止一个已被阻止的 IP，或者取消阻止当前未阻止的 IP，可以使用 "rec_check" 函数来放弃带错误消息的脚本。"
The "rec_check" function is used to abort the script with an error message if you attempt to re-block an already-blocked IP, or unblock an IP that isn't currently being blocked.
士兵们未阻止群众在其装甲车上喷涂反穆巴拉克的涂鸦。
The soldiers have done nothing to stop the crowds spraying anti-Mubarak graffiti on their armoured vehicles.
一些常见的场景包括，只允许来自信任源的连接、阻止连接到服务器未提供的服务，以及只允许连接到特定服务。
Some common scenarios include allowing connections from trusted sources only, blocking connections to services that are not provided by the server, and allowing connections only to specific services.
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