Buying them tends to push up the price; that tends to influence the yield down so it encourages a lower level of interest rate.

买进它们，导致价格上升；,导致参数降低,所以它鼓励一个低的利率水平。

耶鲁公开课 - 金融市场课程节选

While corporate banking recorded pre-recession margins of 2.51%, the retail banking arm achieved an unprecedented interest yield of 3.91%.

FORBES: U.K. Bank Biz Helps RBS Get Back on Track

The fact that the U.K. banking business has recovered considerably is evident from the net interest yield for the banking operations.

FORBES: U.K. Bank Biz Helps RBS Get Back on Track

Until this year, ministries kept around 1 trillion escudos in bank accounts, where they earned a lower rate of interest than the yield on government bonds.

ECONOMIST: The public sector needs slimming down