This makes interactions with Dai unsafe on any ‘proper’ Ethereum fork (one which changes the chainId).
Regardless of whether the chainId is updated on the fork, usage of Dai on any Ethereum fork could result in loss of Dai on mainnet via replay attack.
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这使得在任何“适当的”以太坊分叉（改变 chainId）上与 Dai 的交互都是不安全的。
无论分叉上的chainId是否更新，在任何以太坊分叉上使用Dai都可能通过重放攻击导致主网上Dai丢失。
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