***的核心技术之一就是发布且半透明交易信息。一般情况下，在网络内导致、运行存放的信息应当是所有节点顾客开放性的，其非常高的画质也使得***技术中的每一个人能查询数据中所有相关信息一起使用的使用。Therefore,blockchain technology has certain advantages in the fields of information sharing and data exchange.

***的重要——系统I34-定制I633-搭建53I9，分布式框架存放不依靠中心化的系统配置或管理机构，在网络中的所有连接点管理员权限与义务都是一样，Therefore,each result can also participate in the recording and maintenance of data.It differs from traditional data structures that rely on the"center"and can achieve point-to-point data transmission and real-time data recording,with higher efficiency and faster speed.

function swap(uint amount0Out,uint amount1Out,address to,bytes calldata data)external lock{

require(amount0Out>0||amount1Out>0,'UniswapV2:INSUFFICIENT_OUTPUT_AMOUNT');

(uint112 _reserve0,uint112 _reserve1,)=getReserves();//gas savings

require(amount0Out<_reserve0&&amount1Out<_reserve1,'UniswapV2:INSUFFICIENT_LIQUIDITY');

uint balance0;

uint balance1;

{//scope for _token{0,1},avoids stack too deep errors

address _token0=token0;

address _token1=token1;

require(to!=_token0&&to!=_token1,'UniswapV2:INVALID_TO');

//其中一个并非0的转出去

if(amount0Out>0)_safeTransfer(_token0,to,amount0Out);//optimistically transfer tokens

if(amount1Out>0)_safeTransfer(_token1,to,amount1Out);//optimistically transfer tokens