但是在1月份，他也不情愿地对外汇衍生品施加了法定准备金来控制对以色列谢克尔的投机性买入行为。
Yet in January he reluctantly imposed reserve requirements on foreign-currency derivatives to cool speculative buying of the shekel.
在衍生类中，您可以替代虚拟方法，从而改变组件的内部行为。
In derived classes, you can override virtual methods, thus changing the internal behavior of the component.
指买入或卖出一种衍生证券(如期权或期货)以对冲部分或全部所持其它证券风险的行为。
The purchase or sale of a derivative security (such as options or futures) in order to reduce or neutralize all or some portion of the risk of holding another security.
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