他排除了“风险标准组合分析工具(Span)”这一由芝加哥商品交易所1988年为清算股权衍生品而开发的保证金工具，他认为该工具对于单名交易来说时不够的。
He rules out the Standard Portfolio Analysis of Risk (Span) margining tool developed by the CME in 1988 for clearing equity derivatives, which he believes is not robust enough for single-name trades.
他排除了“风险标准组合分析工具(Span)”这一由芝加哥商品交易所1988年为清算股权衍生品而开发的保证金工具，他认为该工具对于单名交易来说时不够的。
He rules out the Standard Portfolio Analysis of Risk (Span) margining tool developed by the CME in 1988 for clearing equity derivatives, which he believes is not robust enough for single-name trades.
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