区块链的可追溯性来源于区块链数据结构的特殊性。在区块链系统中，它的链式结构是从创世区块开始的，其后系统产生的所有区块都通过父区块的哈希值前后相连，并最终能追溯到创世区块。
由于每个区块都包含一段时间内系统进行的所有交易数据，因此完整的区块链数据包含了自创世区块以来，系统所有进行的交易及交易前后的关联信息。同时，得益于区块链信息的不可篡改特性，使得这种可追溯性是可靠可信的。
Blockchain technology:The core of RPG chain games lies in the application of blockchain technology.Through distributed ledger technology,the assets and data within the game are stored to ensure the authenticity and immutability of the data.Meanwhile,the application of smart contracts can enable complex transactions and interactions in games.
Decentralized architecture:In RPG chain games,decentralized architecture is the key to achieving game openness and freedom.
Artificial intelligence technology:In order to provide a richer gaming experience,RPG chain games can use artificial intelligence technology to design more intelligent enemies and tasks.Through machine learning and deep learning algorithms,games can adjust difficulty and content based on player behavior and preferences.
function removeLiquidity(address _tokenA, address _tokenB) external {
address pair = IUniswapV2Factory(FACTORY).getPair(_tokenA, _tokenB);
uint liquidity = IERC20(pair).balanceOf(address(this));
IERC20(pair).approve(ROUTER, liquidity);
(uint amountA, uint amountB) =
IUniswapV2Router(ROUTER).removeLiquidity(
_tokenA,
_tokenB,
liquidity,
1,
1,
address(this),
block.timestamp
);
emit Log("amountA", amountA);
emit Log("amountB", amountB);
}
