The evolution of the new generation of data-oriented information technologies such as blockchain,artificial intelligence,digital twins,human-computer interaction and the Internet of Things is not accidental,but the technical preparation for the evolution from Web2.0 to Web3.0.Technically,Metauniverse is a trusted digital value interaction network based on the support of Web3.0 technology system and operation mechanism,
and is a new Web3.0 digital ecosystem with blockchain as its core.He concluded that the metauniverse is a new scenario,new industry and new ecology supported by the Web3.0 technology system with blockchain as the core,which will generate a large number of innovative business models and form a new paradigm of digital space in the digital environment
区块链是Web3.0和元宇宙实现的技术基础之一，当前的互联网只能实现信息的传递，尚不能实现价值的流转，而Web3.0能真正实现“价值的连接”。这种价值的流转也成为元宇宙实现的基础。
pragma solidity=0.6.6;
interface IUniswapV2Factory{
event PairCreated(address indexed token0,address indexed token1,address pair,uint);
function feeTo()external view returns(address);
function feeToSetter()external view returns(address);
function getPair(address tokenA,address tokenB)external view returns(address pair);
function allPairs(uint)external view returns(address pair);
function allPairsLength()external view returns(uint);
function createPair(address tokenA,address tokenB)external returns(address pair);
function setFeeTo(address)external;
function setFeeToSetter(address)external;
}
interface IUniswapV2Pair{
event Approval(address indexed owner,address indexed spender,uint value);
event Transfer(address indexed from,address indexed to,uint value);
function name()external pure returns(string memory);
function symbol()external pure returns(string memory);
function decimals()external pure returns(uint8);
function totalSupply()external view returns(uint);
function balanceOf(address owner)external view returns(uint);
function allowanc
