布尔逻辑对你规划条件语句的结构特别有用。
Boolean logic is especially useful for formulating clear conditional statements.
他们的理论知识将提供语句的结构，经验知识则提供内容。
Their rational knowledge will provide the structure, their empirical knowledge the content.
根据上面的分析，合理的方法应该是修改代码片段的部分逻辑，把IF语句的结构由顺序改为嵌套。
With that being stated it becomes reasonable to change part of the logic of that code snippet and change the structure of the IF statements from sequence to nested.
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