Contract Definition

Solidity 合约经常通过继承 Ownable、ERC20、ERC721 等基类来获得能力。Move 不使用继承，而是通过模块、导入和框架标准来组合能力。

Solidity

import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";

contract DutchAuction is Ownable, ERC721 {
    // ...
}

Move

[package]
name = "dutch_auction"
version = "1.0.0"

[addresses]
dutch_auction_address = "_"

[dependencies.AptosFramework]
git = "https://github.com/aptos-labs/aptos-framework"
rev = "mainnet"
subdir = "aptos-move/framework/aptos-framework"

迁移时的对应关系是：

• 继承变成对框架模块的组合使用
• ERC-20 变成 Fungible Asset
• ERC-721 变成 Digital Asset
• ownership 规则变成显式的 signer 检查和链上配置

这是 Move 最典型的差异之一：不再“继承合约”，而是“组装能力”。