您可以自己想象一下如何能将此例中的SQL扩展成一个有些复杂性的sql语句。

You can imagine, though, how you can extend this example to SQL statements of any complexity.

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造成这种复杂性的部分原因是出现了一种常见的错误：通过大量的if语句捕捉所有处理逻辑来实现event方法。

This complexity is partly caused by the common mistake of implementing the event method with a large if statement to capture all the handling logic.

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然而，由于人类语言的复杂性和局限性，语句模糊和语句歧义，往往造成合同意思表示不明确；

Otherwise, due to the complexity and limitation of the language, sentences ambiguity and different meanings, which often causes undefined and missing meanings of contract.

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