美股期货维持震荡。现货黄金微涨0.1%。特朗普：发出的关税信函基本上是最终方案。8月1日作为贸易谈判的截止日期已明确，但也有其他可能。如果我们更喜欢其他国家的（贸易谈判）提议，我会采取的。

Group 1 - U.S. stock futures remain volatile, indicating uncertainty in the market [1] - Spot gold has seen a slight increase of 0.1%, reflecting a potential safe-haven demand [1] - Trump stated that the tariff letter issued is essentially the final proposal, suggesting a firm stance in trade negotiations [1] Group 2 - The deadline for trade negotiations is set for August 1, but there are indications of other possible outcomes [1] - Trump mentioned a willingness to consider proposals from other countries if they are preferred, indicating flexibility in trade discussions [1]