如果查找成功，就检索可以作为散列引用回给调用者的那一行。

If this succeeds, that row is retrieved as a hash reference that can be returned to the caller.

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编写函数，求查找成功时的平均查找长度(asl)。

Write a function, seeking to find the average successful search length (ASL).

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通常，通过查找超类并确保存在匹配的超级构造函数，类型检查器确保这些超级构造函数调用会成功。

Normally, the type checker ensures that these super-constructor calls will succeed by looking up the superclass and making sure that a matching super-constructor exists.

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