艾菲尔铁塔看起来惊人的部分原因在于它是一个递归的解决方案，塔上之塔。
The Eiffel tower looks striking partly because it is a recursive solution, a tower on a tower.
用递归方法对这些递归关系的直接实现会造成解决方案效率低下，因为其中包含了对子问题的多次计算。
The naive implementation of this recurrence relation as a recursive method would have led to an inefficient solution involving multiple computations of subproblems.
这种业务服务的递归复合是SOA最重要的特性之一，它使我们可以快速地在现有业务服务的基础上构建新的解决方案。
Such recursive composition of business services is one of the most important features of SOA, allowing to rapidly build new solutions based on the existing business services.
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