现在，我们可以推出第二个概念：自然发生。

And now we can introduce our second concept: emergence.

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第二个重要的概念是扩展点（extension point）。

The second important concept is the extension point.

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创建的第二个规则应该提取概念类型Area。

The second rule that you create should extract the concept type Area. For example.

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我们的第二个对象设计概念是完整性概念。

Our second object design concept is that of completeness.

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接著我们需要明白第二个重要的概念。

Next we need to understand a second important concept.

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第二个相关概念是控制项可视性。

A second and related concept is control visibility.

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第二个要害性的概念是有用时间。

The second critical idea is Useful Life.

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第二个要害性的概念是有用时间。

The second critical idea is Useful Life.

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