美国财政部拍卖三个月期国债，得标利率4.255%（5月19日为4.285%），投标倍数3.18（前次为2.76）。拍卖六个月期国债，得标利率4.160%（5月19日为4.140%），投标倍数2.95（前次为2.59）。

Group 1 - The U.S. Treasury auctioned three-month Treasury bills with a winning yield of 4.255%, down from 4.285% on May 19 [1] - The bid-to-cover ratio for the three-month bills was 3.18, an increase from the previous ratio of 2.76 [1] - The auction of six-month Treasury bills had a winning yield of 4.160%, slightly up from 4.140% on May 19 [1] Group 2 - The bid-to-cover ratio for the six-month bills was 2.95, compared to the previous ratio of 2.59 [1]