比特币回升至8.4万美元，纳斯达克100指数期货涨幅扩大

Group 1 - Bitcoin has rebounded from $80,600 to $84,000, with the intraday decline narrowing to 6% [1] - Nasdaq 100 index futures have increased by 0.51% [1] - Nvidia has recovered all its pre-market losses and is now up by 0.7% [1] Group 2 - Federal Reserve's "number three" official, Williams, has brought hope to the pessimistic market by expressing an open attitude towards potential interest rate cuts [1]