From the perspective of conceptual model,the metauniverse is the superposition of technology system,content system,economic system,cooperation system and governance system.The core of the technical system is integration,and its technical system should be characterized by open source,programmability,interconnection,

scalability,pluggable and other technical features;The core of the content system is communication,which should have the ability of multiple content generation modes,content presentation modes and content operation management

　function pairFor(address factory,address tokenA,address tokenB)internal pure returns(address pair){

　　(address token0,address token1)=sortTokens(tokenA,tokenB);

　　pair=address(uint(keccak256(abi.encodePacked(

　　hex'ff',

　　factory,

　　keccak256(abi.encodePacked(token0,token1)),

　　hex'96e8ac4277198ff8b6f785478aa9a39f403cb768dd02cbee326c3e7da348845f'//init code hash

　　))));

　　}案例及源碼I35模式7O98開發(fā)O7I8

　　//fetches and sorts the reserves for a pair

　　//獲取并排序一對的儲備

　　function getReserves(address factory,address tokenA,address tokenB)internal view returns(uint reserveA,uint reserveB){

　　(address token0,)=sortTokens(tokenA,tokenB);

　　(uint reserve0,uint reserve1,)=IUniswapV2Pair(pairFor(factory,tokenA,tokenB)).getReserves();

　　(reserveA,reserveB)=tokenA==token0?(reserve0,reserve1):(reserve1,reserve0);

　　}

　　//given some amount of an asset and pair reserves,returns an equivalent amount of the other asset

　　//給定一定數(shù)量的資產(chǎn)和配對準備金，返回等量的其他資產(chǎn)

　　//BB/AA=B/A-->BB=AA*(B/A)

　　function quote(uint amountA,uint reserveA,uint reserveB)internal pure returns(uint amountB){

　　require(amountA>0,'UniswapV2Library:INSUFFICIENT_AMOUNT');

　　require(reserveA>0&&reserveB>0,'UniswapV2Library:INSUFFICIENT_LIQUIDITY');

　　amountB=amountA.mul(reserveB)/reserveA;

　　}