智能合约系统根据事件描述信息中包含的触发条件，当触发系统-176搭建-0206+可电可微-5616条件满足时，从智能合约自动发出预设的数据资源，以及包括触发条件的事件；整个智能合约系统的核心就在于智能合约以事务和事件的方式经过智能合约模块的处理，出去还是一组事务和事件；智能合约只是一个事务处理模块和状态机构成的系统，它不产生智能合约，也不会修改智能合约；它的存在只是为了让一组复杂的、带有触发条件的数字化承诺能够按照参与者的意志，正确执行。
Miners create contracts or execute contract codes in the local sandbox execution environment(such as Ethereum virtual machine)after receiving contract creation or calling transactions.The contract codes automatically judge whether the current scene meets the contract trigger conditions according to the inspection information of trusted external data sources(also known as oracle machine machines)and world state,so as to strictly implement the response rules and update the world state.After the transaction is verified to be valid,it is packaged into new data blocks,After being authenticated by consensus algorithm,the new block is linked to the blockchain main chain,and all updates take effect
***技术，也被称之为分布式账本技术，是一种互联网数据库技术，其特点是去中心化、公开透明，让每个人均可参与数据库记录。***技术不是一个单项的技术，而是一个集成了多方面研究成果基础之上的综合性技术系统。其中有三项必不可缺的核心技术，分别是：共识机制、密码学原理和分布式数据存储。
pragma solidity =0.5.16;
import './interfaces/IUniswapV2Factory.sol';
import './UniswapV2Pair.sol';
contract UniswapV2Factory is IUniswapV2Factory {
address public feeTo;
address public feeToSetter;
mapping(address => mapping(address => address)) public getPair;
address[] public allPairs;
event PairCreated(address indexed token0, address indexed token1, address pair, uint);
// 初始化就设定好谁是设定手续费接收的人的设定者
constructor(address _feeToSetter) public {
feeToSetter = _feeToSetter;