"We'll need to work together on issues that are in the national interest on which there is no need to compete or permanently bicker,".

VOA: standard.2009.04.25

So we have--U.S. Government issues bills and that's less than or equal to one year and they pay no interest.

美国政府发行的短期国库券,期限通常小于或等于一年,且不付息

耶鲁公开课 - 金融市场课程节选