/clear: 从玩家的物品栏中移除物品，可以清空全部，也可以只移除指定的物品和数量。
语法
<尖括号> 内为必填，[方括号] 内为可选。
/clear [player: selection] [itemName: item] [data: int] [maxCount: int]/clear
命令: 命令
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