本技巧从问题的简单的描述开始：定义组合数据库键。

This tip starts with a simple description of the problem: defining a composite database key.

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定义组合以后，需要将其连同相关组件实现构件一起部署到运行时中。

Once a composite is defined, it needs to be deployed along with the related component implementation artifacts into a runtime.

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这些注释用于定义组合键列：分别是“STREET”和“CITY”。

These annotations are used to define the composite key columns: "STREET" and "CITY" respectively.

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What is it that--First of all, a portfolio, let's define that.

首先，我们来定义一下什么是投资组合。

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