美国财政部拍卖四个月期国债，得标利率4.210%（7月23日为4.225%），投标倍数3.45（前次为3.55）。

Core Insights - The U.S. Treasury auctioned four-month Treasury bills with a winning yield of 4.210%, a slight decrease from the previous auction yield of 4.225% on July 23 [1] - The bid-to-cover ratio for this auction was 3.45, which is lower than the previous auction's ratio of 3.55, indicating a decrease in demand [1] Summary by Category - Auction Results - Winning yield for four-month Treasury bills was 4.210% [1] - Previous auction yield was 4.225% [1] - Demand Indicators - Bid-to-cover ratio was 3.45 [1] - Previous bid-to-cover ratio was 3.55 [1]