Duplication glitches (dupes) allow players to multiply items infinitely. In version 1.7.10, several powerful duplication methods still work on vanilla servers, and some even function in heavily modded environments. Why Duplication Glitches Work in 1.7.10
：操作相对复杂，需要玩家先建造一个包含粘性活塞和灵魂沙的装置，并在特定区块放置箱子存入要复制的物品，之后保存退出。再次进入后，要拿走箱子中的物品并激活装置，接着用钓鱼竿勾住船，最后不保存游戏（如Alt+F4）强制退出。重新登录时就会发现箱子中的物品已经复原，而你背包里的那份也还在，实现了复制。它的原理是 通过强制关闭让游戏只保存了玩家数据，而世界数据回档 ，从而“恢复”被取走的物品。 minecraft 1710 dupe work
Forcing a server or a specific chunk to crash immediately after an item is dropped or moved, reverting the world data but keeping the player's inventory data. Iconic Vanilla Dupe Methods in 1.7.10 Duplication glitches (dupes) allow players to multiply items
In Minecraft 1.7.10 , several classic duplication glitches exist that rely on mechanical bugs or network timing. These methods are frequently used on older anarchy or technical servers. Notable 1.7.10 Dupe Methods Iconic Vanilla Dupe Methods in 1
Place a piston facing a cactus, leaving a one-block gap. Place a powered rail or detector rail on top of a block attached to the piston.