/xp: 给予或扣除玩家的经验值或等级。
语法
<尖括号> 内为必填，[方括号] 内为可选。 /xp 有 2 种写法：
/xp <amount: int> [player: selection]
/xp <amount: postfix_l> [player: selection]/xp
命令: 命令
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