我认为，在我知道最终类的模样并实际使用过代码之前，我不想声明我的“客户们”可能需要什么。
I figure that until I know the final class shapes and have a little practical usage of the code, I don't want to declare what my clients might need.
对企业当年提取并实际使用的职工教育经费，在不超过计税工资总额2.5%以内的部分，可在企业所得税前扣除。
About enterprise withdrew and the actual use educational expenditure of stuff that year, it can deduct before the enterprise income tax which didn't surpass the total tax wage's 2.5%.
当然，在您开始实际使用并操作树时，您可能会发现这些类别的其他许多有趣的组合和扩展。
Of course, you may find many other curious combinations and extensions of these categories as you begin to use and manipulate trees in practice.
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