uncle block

Ethereum historically rewarded uncle block producers a partial fee to reduce wasted work.以太坊历史曾向叔块生产者奖励部分费用，以减少浪费的工作量。

Uncle blocks are valid blocks that arrived slightly too late to be included in the main chain.叔块是指到达得稍晚一些、未能被纳入主链的有效区块。