注意递归的使用，避免完全while循环。

Note the use of recursion to avoid the while loop entirely.

youdao

为了避免无限递归，Scala要求每一个辅助构造函数调用在它之前定义的构造函数[ScalaSpec2009]。

In order to avoid infinite recursion, Scala requires each auxiliary constructor to invoke another constructor defined before it [ScalaSpec2009].

youdao

为了避免出现类似的递归细化，您应当把可重用的流程分为几个抽象级别。

To avoid such recursive refinements, you should group reusable processes into several abstraction levels.

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