域模型是一个可以序列化为XML的嵌套对象的递归数据结构。
The domain model is a recursive data structure of nested objects that can be serialized as XML.
Lisp 编译器或解释器能够将特定形式的递归翻译为迭代，从而允许以一种更为简单明快的方式来使用递归数据结构（如树结构）。
The Lisp compiler or interpreter can translate certain forms of recursion to iteration, allowing a simpler, cleaner way to work with recursive data structures, such as trees.
它是由递归下行复合数据结构引起的，这种下行方式有时在一次递归调用中要下行多级。
It is caused by recursively descending a composite data structure in such a way that, sometimes, more than one step in the descent is taken in a single recursive call.
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