交易所可按需要于个别股票期权类别增加其他更长期的到期月份。

The Exchange may introduce any other longer-dated expiry month in selected stock option classes as it deems necessary.

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这一策略可以多种形式实施：股票配期权、同一股票的两个类别互配、各种大宗商品进行组合搭配，或用受同一力量影响的任意两项资产进行配对交易。

The strategy can take numerous shapes, matching stocks with options, two classes of the same stock, commodities against each other or just about any two assets that are affected by the same forces.

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其次对存在价值与其它类别的价值尤其是期权价值、准期权价值作出区分。

Then, the differences between existence value and other types of value, especially option value and quasi option value are analyzed.

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