美国财政部拍卖四周期国债，得标利率4.220%（5月8日报4.225%），投标倍数2.91（前次为2.82）。拍卖八周期国债，得标利率4.235%（5月8日报4.225%），投标倍数2.85（前次为2.98）。

Group 1 - The U.S. Treasury auctioned four-year and eight-year government bonds with a winning yield of 4.220% and 4.235% respectively, indicating a slight increase from the previous auction rates of 4.225% [1] - The bid-to-cover ratio for the four-year bonds was 2.91, up from 2.82 in the last auction, suggesting stronger demand [1] - The bid-to-cover ratio for the eight-year bonds was 2.85, slightly down from 2.98 in the previous auction, indicating a decrease in demand compared to the last auction [1]