/fog: 为玩家添加或移除雾设置，改变他们视野中的雾气浓度。
语法
<尖括号> 内为必填，[方括号] 内为可选。 /fog 有 2 种写法：
/fog <victim: selection> <mode: add> <fogId: id> <userProvidedId: id>
/fog <victim: selection> <mode: delete> <userProvidedId: id>/fog
命令: 命令
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