(瑞恩先生欲一次解决问题的数量有限：他的预算方案未触及另外一个最大的项目——社会保障制度，国家养老金方案)。

(There are limits to the number of live rails Mr Ryan is willing to grasp at once: his budget leaves intact the biggest single item in the budget, Social Security, the state pension scheme).

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这些解决方案的最大缺陷就是它们只针对有限类别的应用程序解决问题。

The biggest drawback of these solutions is that they try to solve the problem only for a limited category of applications.

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基本上，精确的预测和评估要求一套现有的算法，或者一个拥有有限数目的明确步骤的分步解决问题的程序。

Basically, accurate prediction and estimation requires the existence of an algorithm, or a step-by-step problem solving procedure with a finite number of well defined steps.

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The next phase, concrete operations, from seven to twelve, you can solve the conservation problem, but still you're limited to the extent you're capable of abstract reasoning.

下一阶段,具体运算阶段,七到十二岁,儿童可以解决守恒问题,但儿童的抽象推理能力仍然有限

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