August 5th 2021 London Upgrade:
The London upgrade introduced EIP-1559, which reformed the transaction fee market, along with changes to how gas refunds are handled and the Ice Age schedule.
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2021 年 8 月 5 日伦敦升级：
伦敦升级引入了 EIP-1559，它改革了交易费用市场，同时改变了 gas 退款的处理方式和冰河时代的时间表。
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