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.
许多服务类别很可能需要相同类型的请求处理，因此理想情况下，您需要根据策略执行服务处理，而不是将其编码到每个请求中。
There are likely to be categories of service that require the same types of request handling so ideally, you want to impose request handling based on policies rather than code it into each request.
category=XXXX 应用中介，以便根据供应商类别添加不同的策略。
category=XXXX to add different policies based on the suppliers category.
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