Next, create an SPL function that returns the area of a circle given its radius.

接着，创建一个spl函数，它将返回给定半径的圆的面积。

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Products of a SPL development are a product family in a domain.

软件产品线的产品是由一个领域内若干产品组成的产品家族。

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Products of a SPL development are a product family in a domain.

软件产品线的产品是由一个领域内若干产品组成的产品家族。

youdao