The first step to improving our data-format validation procedure is to move all the validation logic into a single helper class, from which other methods can invoke it as needed.

改进数据格式验证过程的第一步是将所有的验证逻辑都移至一个助手类中，其它方法可以按需从这个类上调用验证逻辑。

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The single-step statement is another format of income statement which groups all revenues together and then lists and deducts all expenses together without drawing any intermediate subtotals.

单步式利润表是利润表的另外一种形式，它是把所有的收入项列示在一起，然后一次性地扣减所有的费用项，没有中间汇总额。

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