/give @p command_block 给予一个命令方块，命令方块设置为重复、无条件、始终活动

/execute as @a at @s run fill ~-20~-9~-20~20~9~20 netherite_block replace stone 石头变下界合金块

/execute as @a at @s run fill ~-20~-9~-20~20~9~20 diamond_block replace dirt 泥土变钻石块

/execute as @a at @s run fill ~-20~-9~-20~20~9~20 iron_block replace grass 草方块变铁块

/execute as @a at @s run fill ~-20~-9~-20~20~9~20 gold_block replace sand 沙子变金块

/execute as @a at @s run fill ~-20~-9~-20~20~9~20 emerald_block replace leaves 橡树叶变绿宝石块

/kill @e [type=item] 清除掉落物

/gamerule commandblockoutput false 防刷屏

/tickingarea add x y z x y z   设置常加载区块，xyz代表坐标