聚合是一种特别类型的关联，用于描述“总体到局部”的关系。

Aggregation is a special type of association used to model a "whole to its parts" relationship.

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市场的总体信念是，各经济体终将聚合成一体。市场多年来为不同的欧元区国家债券支付相近的金额。

The conviction was that economies would eventually converge, a belief Shared by the markets, which for years paid similar prices for bonds from different euro-zone countries.

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从总体上看，新的聚合扩展点包含一个对象，该对象是IAggregationFactory接口的扩展。

At a high level, the new aggregation extension point consists of an object that is an extension of the IAggregationFactory interface. You overload the methods in this interface to do three things.

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