周四，美国三大股指在纳斯达克前一交易日创纪录收盘后徘徊在平线附近，交易员权衡了持续的贸易发展，并试图忽视新的关税威胁。特朗普总统宣布对巴西进口商品征收50%的关税，并确认对铜进口商品征收的50%关税将于8月1日生效。在经济方面，上周首次申请失业救济人数意外降至23.7万人，而持续申请失业救济的人数增至196.5万人，为2021年以来的最高水平。数据继续表明，劳动力市场仍然稳健，但显示出降温的迹象。在企业新闻方面，英伟达股价上涨0.4%，延续了前一交易日1.8%的涨幅，使其市值达到4万亿美元。持续的人工智能热情以及该公司计划推出一款新的中国专用人工智能芯片的报道推动了这场反弹。与此同时，达美航空公司在公布强于预期的收益后飙升了10%以上。

The three major US stock averages hovered near the flatline on Thursday, following the Nasdaq's fresh record close in the previous session, as traders weighed ongoing trade developments and attempted to look past new tariff threats. President Trump announced a 50% tariff on Brazilian imports and confirmed that a 50% tariff on copper imports will take effect on August 1. On the economic front, initial jobless claims unexpectedly fell to 237K last week, while continuing claims rose to 1.965 million, the highest since 2021. The data continued to point to a labor market that remains solid but is showing signs of cooling. In corporate news, Nvidia shares rose 0.4%, extending the 1.8% gain from the previous session that pushed its market capitalization to $4 trillion. The rally was fueled by continued AI enthusiasm and reports that the company plans to launch a new China-specific AI chip. Meanwhile, Delta Air Lines surged more than 10% after delivering stronger-than-expected earnings.