Fourthly, using this model based on risk nonlinear addition solves the portfolio's risk linear addition problem in SPAN system, and this will help us to get more practical forecasting value.
2
更多高级投资者可能有一些资产的其他选择，例如期权和期货或者其组合。
More advanced investors might also have some of the alternative assets such as options and futures in the mix.
3
一种一个期货合同和一个期权的组合，其中一个看涨一个看跌。
A combination of a futures contract and an option, in which one is bullish and one is bearish.
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