美国财政部拍卖四个月期国债，得标利率4.230%（5月14日报4.240%），投标倍数3.21（前次为3.28）。

Group 1 - The U.S. Treasury auctioned a four-month Treasury bill with a winning yield of 4.230%, a decrease from the previous rate of 4.240% reported on May 14 [1] - The bid-to-cover ratio was 3.21, slightly lower than the previous auction's ratio of 3.28, indicating a decrease in demand for the securities [1]