他们可以象纯金融产品般运作，例如股票和债券。
They can behave like pure financial products like stocks and bonds.
Security：某一持有物的标识符(例如，股票名称)。
Security: Identifier for a holding (for example, the name of a stock).
例如，职工股票先购权的历史成本为0。
The historic cost of employee stock options, for instance, is zero.
例如，职工股票先购权的历史成本为0。
The historic cost of employee stock options, for instance, is zero.
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