It probably has some risk, but the way we approximate things in finance, we take the government as riskless.

它可能存在一定的风险，但在金融学上，我们忽略其风险，将政府债券看作无风险。

耶鲁公开课 - 金融市场课程节选

I have stocks, bonds, and oil but I want also to add one more final asset, we'll call it the riskless asset, long-term bonds are somewhat uncertain and variable because they're long-term.

有股票，债券和石油,我还想再增加最后一种资产，我们称之为无风险资产，由于长期债券持有期限很长,存在一定不确定性及风险。

耶鲁公开课 - 金融市场课程节选