美国财政部拍卖52周期国债，得标利率3.940%（5月13日报3.930%），投标倍数3.22（前次为3.31）。

Group 1 - The U.S. Treasury auctioned 52-week Treasury bills with a winning yield of 3.940%, an increase from the previous rate of 3.930% reported on May 13 [1] - The bid-to-cover ratio was 3.22, slightly lower than the previous ratio of 3.31 [1]