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。

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This number, CUSIP number, is a number that identifies any security.

USIP代码是所有美国股票及注册债券的编号由美国统一证券辨认委员会管理,用于区别每一项证券

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